diff --git a/src/libstore/daemon.cc b/src/libstore/daemon.cc
index 31e2e2af5..5083497a9 100644
--- a/src/libstore/daemon.cc
+++ b/src/libstore/daemon.cc
@@ -408,8 +408,8 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
                 return std::visit(overloaded {
                     [&](const TextIngestionMethod &) {
                         if (hashType != htSHA256)
-                            throw UnimplementedError("Only SHA-256 is supported for adding text-hashed data, but '%1' was given",
-                                printHashType(hashType));
+                            throw UnimplementedError("When adding text-hashed data called '%s', only SHA-256 is supported but '%s' was given",
+                                name, printHashType(hashType));
                         // We could stream this by changing Store
                         std::string contents = source.drain();
                         auto path = store->addTextToStore(name, contents, refs, repair);
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index b3f5251f2..0ed17a6ce 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -631,8 +631,8 @@ ref<const ValidPathInfo> RemoteStore::addCAToStore(
         std::visit(overloaded {
             [&](const TextIngestionMethod & thm) -> void {
                 if (hashType != htSHA256)
-                    throw UnimplementedError("Only SHA-256 is supported for adding text-hashed data, but '%1' was given",
-                        printHashType(hashType));
+                    throw UnimplementedError("When adding text-hashed data called '%s', only SHA-256 is supported but '%s' was given",
+                        name, printHashType(hashType));
                 std::string s = dump.drain();
                 conn->to << wopAddTextToStore << name << s;
                 worker_proto::write(*this, conn->to, references);