diff --git a/qmake/library/qmakeevaluator.cpp b/qmake/library/qmakeevaluator.cpp
index 3f6f0487302..b898929535f 100644
--- a/qmake/library/qmakeevaluator.cpp
+++ b/qmake/library/qmakeevaluator.cpp
@@ -1355,6 +1355,8 @@ QMakeEvaluator::VisitReturn QMakeEvaluator::visitProFile(
                     return ReturnFalse;
             }
 #ifdef PROEVALUATOR_THREAD_SAFE
+            else if (!baseEnv->isOk)
+                return ReturnFalse;
         }
 #endif