diff --git a/src/libstore/build/local-derivation-goal.cc b/src/libstore/build/local-derivation-goal.cc
index ba0aca29c..8320dd1c4 100644
--- a/src/libstore/build/local-derivation-goal.cc
+++ b/src/libstore/build/local-derivation-goal.cc
@@ -2481,6 +2481,7 @@ void LocalDerivationGoal::registerOutputs()
            floating CA derivations and hash-mismatching fixed-output
            derivations. */
         PathLocks dynamicOutputLock;
+        dynamicOutputLock.setDeletion(true);
         auto optFixedPath = output.path(worker.store, drv->name, outputName);
         if (!optFixedPath ||
             worker.store.printStorePath(*optFixedPath) != finalDestPath)