diff --git a/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp b/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp
index 279fe592b3a..265b2cd1f61 100644
--- a/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp
+++ b/tests/auto/corelib/thread/qresultstore/tst_qresultstore.cpp
@@ -549,7 +549,7 @@ struct CountedObject
         const size_t previousLiveCount;
     };
 
-    int id = 0;
+    size_t id = 0;
     static size_t liveCount;
 };