diff --git a/src/shared/proparser/qmakeevaluator.cpp b/src/shared/proparser/qmakeevaluator.cpp
index 0c35a671dca..a18f661d21c 100644
--- a/src/shared/proparser/qmakeevaluator.cpp
+++ b/src/shared/proparser/qmakeevaluator.cpp
@@ -1340,6 +1340,8 @@ QMakeEvaluator::VisitReturn QMakeEvaluator::visitProFile(
                     return ReturnFalse;
             }
 #ifdef PROEVALUATOR_THREAD_SAFE
+            else if (!baseEnv->isOk)
+                return ReturnFalse;
         }
 #endif