diff --git a/src/widgets/kernel/qgesturemanager_p.h b/src/widgets/kernel/qgesturemanager_p.h
index e57652afbac..3df80bab55c 100644
--- a/src/widgets/kernel/qgesturemanager_p.h
+++ b/src/widgets/kernel/qgesturemanager_p.h
@@ -59,6 +59,8 @@
 
 #ifndef QT_NO_GESTURES
 
+#include <functional>
+
 QT_BEGIN_NAMESPACE
 
 class QBasicTimer;
@@ -112,7 +114,7 @@ private:
         ObjectGesture(QObject *o, const Qt::GestureType &g) : object(o), gesture(g) { }
         inline bool operator<(const ObjectGesture &rhs) const
         {
-            if (object < rhs.object)
+            if (std::less<QObject *>{}(object, rhs.object))
                 return true;
             if (object == rhs.object)
                 return gesture < rhs.gesture;