diff --git a/src/corelib/thread/qorderedmutexlocker_p.h b/src/corelib/thread/qorderedmutexlocker_p.h
index 54887342e7..6402be92bf 100644
--- a/src/corelib/thread/qorderedmutexlocker_p.h
+++ b/src/corelib/thread/qorderedmutexlocker_p.h
@@ -93,7 +93,7 @@ public:
         // mtx1 is already locked, mtx2 not... do we need to unlock and relock?
         if (mtx1 == mtx2)
             return false;
-        if (mtx1 < mtx2) {
+        if (std::less<QMutex *>()(mtx1, mtx2)) {
             mtx2->lock();
             return true;
         }