diff --git a/src/corelib/tools/qvarlengtharray.h b/src/corelib/tools/qvarlengtharray.h
index 1530299303..bb5ae78d2b 100644
--- a/src/corelib/tools/qvarlengtharray.h
+++ b/src/corelib/tools/qvarlengtharray.h
@@ -77,7 +77,7 @@ public:
         : a(Prealloc), s(0), ptr(reinterpret_cast<T *>(array))
     {
         if (args.size())
-            append(args.begin(), args.size());
+            append(args.begin(), int(args.size()));
     }
 #endif