diff --git a/tests/auto/concurrent/qtconcurrentmap/tst_qtconcurrentmap.cpp b/tests/auto/concurrent/qtconcurrentmap/tst_qtconcurrentmap.cpp
index 449acf6a787..8d161339446 100644
--- a/tests/auto/concurrent/qtconcurrentmap/tst_qtconcurrentmap.cpp
+++ b/tests/auto/concurrent/qtconcurrentmap/tst_qtconcurrentmap.cpp
@@ -1798,7 +1798,7 @@ void tst_QtConcurrentMap::stlContainers()
     vector.push_back(2);
 
     std::vector<int> vector2 = QtConcurrent::blockingMapped(vector, mapper);
-    QCOMPARE(vector2.size(), 2);
+    QCOMPARE(vector2.size(), 2u);
 
     std::list<int> list;
     list.push_back(1);