diff --git a/src/libstore/build/derivation-goal.cc b/src/libstore/build/derivation-goal.cc
index a4bb94b0e..2aaeaec6e 100644
--- a/src/libstore/build/derivation-goal.cc
+++ b/src/libstore/build/derivation-goal.cc
@@ -1064,7 +1064,7 @@ void DerivationGoal::resolvedFinished()
                 worker.store.registerDrvOutput(newRealisation);
             }
             outputPaths.insert(realisation.outPath);
-            builtOutputs.emplace(wantedOutput, realisation);
+            builtOutputs.emplace(outputName, realisation);
         }
 
         runPostBuildHook(
@@ -1406,7 +1406,7 @@ std::pair<bool, SingleDrvOutputs> DerivationGoal::checkPathValidity()
                 );
             }
         }
-        if (info.wanted && info.known && info.known->isValid())
+        if (info.known && info.known->isValid())
             validOutputs.emplace(i.first, Realisation { drvOutput, info.known->path });
     }
 
@@ -1457,8 +1457,9 @@ void DerivationGoal::done(
     mcRunningBuilds.reset();
 
     if (buildResult.success()) {
-        assert(!builtOutputs.empty());
-        buildResult.builtOutputs = std::move(builtOutputs);
+        auto wantedBuiltOutputs = filterDrvOutputs(wantedOutputs, std::move(builtOutputs));
+        assert(!wantedBuiltOutputs.empty());
+        buildResult.builtOutputs = std::move(wantedBuiltOutputs);
         if (status == BuildResult::Built)
             worker.doneBuilds++;
     } else {
diff --git a/src/libstore/build/derivation-goal.hh b/src/libstore/build/derivation-goal.hh
index 7033b7a58..01a08d391 100644
--- a/src/libstore/build/derivation-goal.hh
+++ b/src/libstore/build/derivation-goal.hh
@@ -306,15 +306,13 @@ struct DerivationGoal : public Goal
      * Update 'initialOutputs' to determine the current status of the
      * outputs of the derivation. Also returns a Boolean denoting
      * whether all outputs are valid and non-corrupt, and a
-     * 'SingleDrvOutputs' structure containing the valid and wanted
-     * outputs.
+     * 'SingleDrvOutputs' structure containing the valid outputs.
      */
     std::pair<bool, SingleDrvOutputs> checkPathValidity();
 
     /**
      * Aborts if any output is not valid or corrupt, and otherwise
-     * returns a 'SingleDrvOutputs' structure containing the wanted
-     * outputs.
+     * returns a 'SingleDrvOutputs' structure containing all outputs.
      */
     SingleDrvOutputs assertPathValidity();
 
diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc
index 21cd6e7ee..2f545627b 100644
--- a/src/libstore/build/local-derivation-goal.cc
+++ b/src/libstore/build/local-derivation-goal.cc
@@ -2701,8 +2701,7 @@ SingleDrvOutputs LocalDerivationGoal::registerOutputs()
             signRealisation(thisRealisation);
             worker.store.registerDrvOutput(thisRealisation);
         }
-        if (wantedOutputs.contains(outputName))
-            builtOutputs.emplace(outputName, thisRealisation);
+        builtOutputs.emplace(outputName, thisRealisation);
     }
 
     return builtOutputs;
diff --git a/src/libstore/realisation.cc b/src/libstore/realisation.cc
index d63ec5ea2..93ddb5b20 100644
--- a/src/libstore/realisation.cc
+++ b/src/libstore/realisation.cc
@@ -136,6 +136,19 @@ size_t Realisation::checkSignatures(const PublicKeys & publicKeys) const
     return good;
 }
 
+
+SingleDrvOutputs filterDrvOutputs(const OutputsSpec& wanted, SingleDrvOutputs&& outputs)
+{
+    SingleDrvOutputs ret = std::move(outputs);
+    for (auto it = ret.begin(); it != ret.end(); ) {
+        if (!wanted.contains(it->first))
+            it = ret.erase(it);
+        else
+            ++it;
+    }
+    return ret;
+}
+
 StorePath RealisedPath::path() const {
     return std::visit([](auto && arg) { return arg.getPath(); }, raw);
 }
diff --git a/src/libstore/realisation.hh b/src/libstore/realisation.hh
index 3922d1267..2a093c128 100644
--- a/src/libstore/realisation.hh
+++ b/src/libstore/realisation.hh
@@ -12,6 +12,7 @@
 namespace nix {
 
 class Store;
+struct OutputsSpec;
 
 /**
  * A general `Realisation` key.
@@ -93,6 +94,14 @@ typedef std::map<std::string, Realisation> SingleDrvOutputs;
  */
 typedef std::map<DrvOutput, Realisation> DrvOutputs;
 
+/**
+ * Filter a SingleDrvOutputs to include only specific output names
+ *
+ * Moves the `outputs` input.
+ */
+SingleDrvOutputs filterDrvOutputs(const OutputsSpec&, SingleDrvOutputs&&);
+
+
 struct OpaquePath {
     StorePath path;