diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index e2115bc80215cfa9997e26c225eb5493686a4f52..cec03fee42a494d2d5a412277a3e88738d0d16b8 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2852,6 +2852,7 @@ void SubstitutionGoal::finished()
     worker.store.registerValidPath(info2);
 
     outputLock->setDeletion(true);
+    outputLock.reset();
 
     worker.store.markContentsGood(storePath);