diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 928858203..c688acd58 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1976,7 +1976,7 @@ HookReply DerivationGoal::tryBuildHook()
 
     /* Tell the hook all the inputs that have to be copied to the
        remote system. */
-    nix::worker_proto::write(worker.store, hook->sink, inputPaths);
+    worker_proto::write(worker.store, hook->sink, inputPaths);
 
     /* Tell the hooks the missing outputs that have to be copied back
        from the remote system. */
@@ -1987,7 +1987,7 @@ HookReply DerivationGoal::tryBuildHook()
             if (buildMode != bmCheck && status.known->isValid()) continue;
             missingPaths.insert(status.known->path);
         }
-        nix::worker_proto::write(worker.store, hook->sink, missingPaths);
+        worker_proto::write(worker.store, hook->sink, missingPaths);
     }
 
     hook->sink = FdSink();
diff --git a/src/libstore/daemon.cc b/src/libstore/daemon.cc
index 72203d1b2..0713c4853 100644
--- a/src/libstore/daemon.cc
+++ b/src/libstore/daemon.cc
@@ -247,7 +247,7 @@ static void writeValidPathInfo(
 {
     to << (info->deriver ? store->printStorePath(*info->deriver) : "")
        << info->narHash.to_string(Base16, false);
-    nix::worker_proto::write(*store, to, info->references);
+    worker_proto::write(*store, to, info->references);
     to << info->registrationTime << info->narSize;
     if (GET_PROTOCOL_MINOR(clientVersion) >= 16) {
         to << info->ultimate
@@ -272,11 +272,11 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
     }
 
     case wopQueryValidPaths: {
-        auto paths = nix::worker_proto::read(*store, from, Phantom<StorePathSet> {});
+        auto paths = worker_proto::read(*store, from, Phantom<StorePathSet> {});
         logger->startWork();
         auto res = store->queryValidPaths(paths);
         logger->stopWork();
-        nix::worker_proto::write(*store, to, res);
+        worker_proto::write(*store, to, res);
         break;
     }
 
@@ -292,11 +292,11 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
     }
 
     case wopQuerySubstitutablePaths: {
-        auto paths = nix::worker_proto::read(*store, from, Phantom<StorePathSet> {});
+        auto paths = worker_proto::read(*store, from, Phantom<StorePathSet> {});
         logger->startWork();
         auto res = store->querySubstitutablePaths(paths);
         logger->stopWork();
-        nix::worker_proto::write(*store, to, res);
+        worker_proto::write(*store, to, res);
         break;
     }
 
@@ -325,7 +325,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
             paths = store->queryValidDerivers(path);
         else paths = store->queryDerivationOutputs(path);
         logger->stopWork();
-        nix::worker_proto::write(*store, to, paths);
+        worker_proto::write(*store, to, paths);
         break;
     }
 
@@ -343,7 +343,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         logger->startWork();
         auto outputs = store->queryPartialDerivationOutputMap(path);
         logger->stopWork();
-        nix::worker_proto::write(*store, to, outputs);
+        worker_proto::write(*store, to, outputs);
         break;
     }
 
@@ -369,7 +369,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         if (GET_PROTOCOL_MINOR(clientVersion) >= 25) {
             auto name = readString(from);
             auto camStr = readString(from);
-            auto refs = nix::worker_proto::read(*store, from, Phantom<StorePathSet> {});
+            auto refs = worker_proto::read(*store, from, Phantom<StorePathSet> {});
             bool repairBool;
             from >> repairBool;
             auto repair = RepairFlag{repairBool};
@@ -449,7 +449,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
     case wopAddTextToStore: {
         string suffix = readString(from);
         string s = readString(from);
-        auto refs = nix::worker_proto::read(*store, from, Phantom<StorePathSet> {});
+        auto refs = worker_proto::read(*store, from, Phantom<StorePathSet> {});
         logger->startWork();
         auto path = store->addTextToStore(suffix, s, refs, NoRepair);
         logger->stopWork();
@@ -608,7 +608,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
     case wopCollectGarbage: {
         GCOptions options;
         options.action = (GCOptions::GCAction) readInt(from);
-        options.pathsToDelete = nix::worker_proto::read(*store, from, Phantom<StorePathSet> {});
+        options.pathsToDelete = worker_proto::read(*store, from, Phantom<StorePathSet> {});
         from >> options.ignoreLiveness >> options.maxFreed;
         // obsolete fields
         readInt(from);
@@ -677,7 +677,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         else {
             to << 1
                << (i->second.deriver ? store->printStorePath(*i->second.deriver) : "");
-            nix::worker_proto::write(*store, to, i->second.references);
+            worker_proto::write(*store, to, i->second.references);
             to << i->second.downloadSize
                << i->second.narSize;
         }
@@ -688,11 +688,11 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         SubstitutablePathInfos infos;
         StorePathCAMap pathsMap = {};
         if (GET_PROTOCOL_MINOR(clientVersion) < 22) {
-            auto paths = nix::worker_proto::read(*store, from, Phantom<StorePathSet> {});
+            auto paths = worker_proto::read(*store, from, Phantom<StorePathSet> {});
             for (auto & path : paths)
                 pathsMap.emplace(path, std::nullopt);
         } else
-            pathsMap = nix::worker_proto::read(*store, from, Phantom<StorePathCAMap> {});
+            pathsMap = worker_proto::read(*store, from, Phantom<StorePathCAMap> {});
         logger->startWork();
         store->querySubstitutablePathInfos(pathsMap, infos);
         logger->stopWork();
@@ -700,7 +700,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         for (auto & i : infos) {
             to << store->printStorePath(i.first)
                << (i.second.deriver ? store->printStorePath(*i.second.deriver) : "");
-            nix::worker_proto::write(*store, to, i.second.references);
+            worker_proto::write(*store, to, i.second.references);
             to << i.second.downloadSize << i.second.narSize;
         }
         break;
@@ -710,7 +710,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         logger->startWork();
         auto paths = store->queryAllValidPaths();
         logger->stopWork();
-        nix::worker_proto::write(*store, to, paths);
+        worker_proto::write(*store, to, paths);
         break;
     }
 
@@ -782,7 +782,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         ValidPathInfo info { path, narHash };
         if (deriver != "")
             info.deriver = store->parseStorePath(deriver);
-        info.references = nix::worker_proto::read(*store, from, Phantom<StorePathSet> {});
+        info.references = worker_proto::read(*store, from, Phantom<StorePathSet> {});
         from >> info.registrationTime >> info.narSize >> info.ultimate;
         info.sigs = readStrings<StringSet>(from);
         info.ca = parseContentAddressOpt(readString(from));
@@ -835,9 +835,9 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         uint64_t downloadSize, narSize;
         store->queryMissing(targets, willBuild, willSubstitute, unknown, downloadSize, narSize);
         logger->stopWork();
-        nix::worker_proto::write(*store, to, willBuild);
-        nix::worker_proto::write(*store, to, willSubstitute);
-        nix::worker_proto::write(*store, to, unknown);
+        worker_proto::write(*store, to, willBuild);
+        worker_proto::write(*store, to, willSubstitute);
+        worker_proto::write(*store, to, unknown);
         to << downloadSize << narSize;
         break;
     }
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index f8e7d773b..7ffc94818 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -584,7 +584,7 @@ Source & readDerivation(Source & in, const Store & store, BasicDerivation & drv,
         drv.outputs.emplace(std::move(name), std::move(output));
     }
 
-    drv.inputSrcs = nix::worker_proto::read(store, in, Phantom<StorePathSet> {});
+    drv.inputSrcs = worker_proto::read(store, in, Phantom<StorePathSet> {});
     in >> drv.platform >> drv.builder;
     drv.args = readStrings<Strings>(in);
 
@@ -622,7 +622,7 @@ void writeDerivation(Sink & out, const Store & store, const BasicDerivation & dr
             },
         }, i.second.output);
     }
-    nix::worker_proto::write(store, out, drv.inputSrcs);
+    worker_proto::write(store, out, drv.inputSrcs);
     out << drv.platform << drv.builder << drv.args;
     out << drv.env.size();
     for (auto & i : drv.env)
diff --git a/src/libstore/export-import.cc b/src/libstore/export-import.cc
index 40a6f3c63..02c839520 100644
--- a/src/libstore/export-import.cc
+++ b/src/libstore/export-import.cc
@@ -45,7 +45,7 @@ void Store::exportPath(const StorePath & path, Sink & sink)
     teeSink
         << exportMagic
         << printStorePath(path);
-    nix::worker_proto::write(*this, teeSink, info->references);
+    worker_proto::write(*this, teeSink, info->references);
     teeSink
         << (info->deriver ? printStorePath(*info->deriver) : "")
         << 0;
@@ -73,7 +73,7 @@ StorePaths Store::importPaths(Source & source, CheckSigsFlag checkSigs)
 
         //Activity act(*logger, lvlInfo, format("importing path '%s'") % info.path);
 
-        auto references = nix::worker_proto::read(*this, source, Phantom<StorePathSet> {});
+        auto references = worker_proto::read(*this, source, Phantom<StorePathSet> {});
         auto deriver = readString(source);
         auto narHash = hashString(htSHA256, *saved.s);
 
diff --git a/src/libstore/legacy-ssh-store.cc b/src/libstore/legacy-ssh-store.cc
index e056859fd..6db44047d 100644
--- a/src/libstore/legacy-ssh-store.cc
+++ b/src/libstore/legacy-ssh-store.cc
@@ -122,7 +122,7 @@ struct LegacySSHStore : public Store, public virtual LegacySSHStoreConfig
             auto deriver = readString(conn->from);
             if (deriver != "")
                 info->deriver = parseStorePath(deriver);
-            info->references = nix::worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
+            info->references = worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
             readLongLong(conn->from); // download size
             info->narSize = readLongLong(conn->from);
 
@@ -156,7 +156,7 @@ struct LegacySSHStore : public Store, public virtual LegacySSHStoreConfig
                 << printStorePath(info.path)
                 << (info.deriver ? printStorePath(*info.deriver) : "")
                 << info.narHash.to_string(Base16, false);
-            nix::worker_proto::write(*this, conn->to, info.references);
+            worker_proto::write(*this, conn->to, info.references);
             conn->to
                 << info.registrationTime
                 << info.narSize
@@ -185,7 +185,7 @@ struct LegacySSHStore : public Store, public virtual LegacySSHStoreConfig
             conn->to
                 << exportMagic
                 << printStorePath(info.path);
-            nix::worker_proto::write(*this, conn->to, info.references);
+            worker_proto::write(*this, conn->to, info.references);
             conn->to
                 << (info.deriver ? printStorePath(*info.deriver) : "")
                 << 0
@@ -301,10 +301,10 @@ public:
         conn->to
             << cmdQueryClosure
             << includeOutputs;
-        nix::worker_proto::write(*this, conn->to, paths);
+        worker_proto::write(*this, conn->to, paths);
         conn->to.flush();
 
-        for (auto & i : nix::worker_proto::read(*this, conn->from, Phantom<StorePathSet> {}))
+        for (auto & i : worker_proto::read(*this, conn->from, Phantom<StorePathSet> {}))
             out.insert(i);
     }
 
@@ -317,10 +317,10 @@ public:
             << cmdQueryValidPaths
             << false // lock
             << maybeSubstitute;
-        nix::worker_proto::write(*this, conn->to, paths);
+        worker_proto::write(*this, conn->to, paths);
         conn->to.flush();
 
-        return nix::worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
+        return worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
     }
 
     void connect() override
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 43853db4e..049d4e954 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -329,7 +329,7 @@ StorePathSet RemoteStore::queryValidPaths(const StorePathSet & paths, Substitute
         return res;
     } else {
         conn->to << wopQueryValidPaths;
-        nix::worker_proto::write(*this, conn->to, paths);
+        worker_proto::write(*this, conn->to, paths);
         conn.processStderr();
         return worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
     }
@@ -341,7 +341,7 @@ StorePathSet RemoteStore::queryAllValidPaths()
     auto conn(getConnection());
     conn->to << wopQueryAllValidPaths;
     conn.processStderr();
-    return nix::worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
+    return worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
 }
 
 
@@ -358,7 +358,7 @@ StorePathSet RemoteStore::querySubstitutablePaths(const StorePathSet & paths)
         return res;
     } else {
         conn->to << wopQuerySubstitutablePaths;
-        nix::worker_proto::write(*this, conn->to, paths);
+        worker_proto::write(*this, conn->to, paths);
         conn.processStderr();
         return worker_proto::read(*this, conn->from, Phantom<StorePathSet> {});
     }
diff --git a/src/libstore/worker-protocol.hh b/src/libstore/worker-protocol.hh
index fd6c2b2cf..2934c1d67 100644
--- a/src/libstore/worker-protocol.hh
+++ b/src/libstore/worker-protocol.hh
@@ -153,7 +153,7 @@ void write(const Store & store, Sink & out, const std::optional<T> & optVal)
 {
     out << (uint64_t) (optVal ? 1 : 0);
     if (optVal)
-        nix::worker_proto::write(store, out, *optVal);
+        worker_proto::write(store, out, *optVal);
 }
 
 /* Specialization which uses and empty string for the empty case, taking
diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc
index 4dcdebe2f..da91caef1 100644
--- a/src/nix-store/nix-store.cc
+++ b/src/nix-store/nix-store.cc
@@ -822,7 +822,7 @@ static void opServe(Strings opFlags, Strings opArgs)
             case cmdQueryValidPaths: {
                 bool lock = readInt(in);
                 bool substitute = readInt(in);
-                auto paths = nix::worker_proto::read(*store, in, Phantom<StorePathSet> {});
+                auto paths = worker_proto::read(*store, in, Phantom<StorePathSet> {});
                 if (lock && writeAllowed)
                     for (auto & path : paths)
                         store->addTempRoot(path);
@@ -852,19 +852,19 @@ static void opServe(Strings opFlags, Strings opArgs)
                         }
                 }
 
-                nix::worker_proto::write(*store, out, store->queryValidPaths(paths));
+                worker_proto::write(*store, out, store->queryValidPaths(paths));
                 break;
             }
 
             case cmdQueryPathInfos: {
-                auto paths = nix::worker_proto::read(*store, in, Phantom<StorePathSet> {});
+                auto paths = worker_proto::read(*store, in, Phantom<StorePathSet> {});
                 // !!! Maybe we want a queryPathInfos?
                 for (auto & i : paths) {
                     try {
                         auto info = store->queryPathInfo(i);
                         out << store->printStorePath(info->path)
                             << (info->deriver ? store->printStorePath(*info->deriver) : "");
-                        nix::worker_proto::write(*store, out, info->references);
+                        worker_proto::write(*store, out, info->references);
                         // !!! Maybe we want compression?
                         out << info->narSize // downloadSize
                             << info->narSize;
@@ -892,7 +892,7 @@ static void opServe(Strings opFlags, Strings opArgs)
 
             case cmdExportPaths: {
                 readInt(in); // obsolete
-                store->exportPaths(nix::worker_proto::read(*store, in, Phantom<StorePathSet> {}), out);
+                store->exportPaths(worker_proto::read(*store, in, Phantom<StorePathSet> {}), out);
                 break;
             }
 
@@ -941,9 +941,9 @@ static void opServe(Strings opFlags, Strings opArgs)
             case cmdQueryClosure: {
                 bool includeOutputs = readInt(in);
                 StorePathSet closure;
-                store->computeFSClosure(nix::worker_proto::read(*store, in, Phantom<StorePathSet> {}),
+                store->computeFSClosure(worker_proto::read(*store, in, Phantom<StorePathSet> {}),
                     closure, false, includeOutputs);
-                nix::worker_proto::write(*store, out, closure);
+                worker_proto::write(*store, out, closure);
                 break;
             }
 
@@ -958,7 +958,7 @@ static void opServe(Strings opFlags, Strings opArgs)
                 };
                 if (deriver != "")
                     info.deriver = store->parseStorePath(deriver);
-                info.references = nix::worker_proto::read(*store, in, Phantom<StorePathSet> {});
+                info.references = worker_proto::read(*store, in, Phantom<StorePathSet> {});
                 in >> info.registrationTime >> info.narSize >> info.ultimate;
                 info.sigs = readStrings<StringSet>(in);
                 info.ca = parseContentAddressOpt(readString(in));