diff --git a/src/corelib/kernel/qeventdispatcher_win_p.h b/src/corelib/kernel/qeventdispatcher_win_p.h
index 6b4fb18f469..e59e29f1ffa 100644
--- a/src/corelib/kernel/qeventdispatcher_win_p.h
+++ b/src/corelib/kernel/qeventdispatcher_win_p.h
@@ -58,7 +58,7 @@ class QEventDispatcherWin32Private;
 
 // forward declaration
 LRESULT QT_WIN_CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPARAM lp);
-int qt_msectime();
+quint64 qt_msectime();
 
 class Q_CORE_EXPORT QEventDispatcherWin32 : public QAbstractEventDispatcher
 {
diff --git a/src/corelib/kernel/qeventdispatcher_winrt_p.h b/src/corelib/kernel/qeventdispatcher_winrt_p.h
index e39746aeefa..fd3d259c96b 100644
--- a/src/corelib/kernel/qeventdispatcher_winrt_p.h
+++ b/src/corelib/kernel/qeventdispatcher_winrt_p.h
@@ -52,7 +52,7 @@
 
 QT_BEGIN_NAMESPACE
 
-int qt_msectime();
+quint64 qt_msectime();
 
 class QEventDispatcherWinRTPrivate;
 
diff --git a/src/corelib/tools/qelapsedtimer_win.cpp b/src/corelib/tools/qelapsedtimer_win.cpp
index eab2f8ef6cd..b80c23cf8f9 100644
--- a/src/corelib/tools/qelapsedtimer_win.cpp
+++ b/src/corelib/tools/qelapsedtimer_win.cpp
@@ -117,7 +117,7 @@ static quint64 getTickCount()
 #endif // Q_OS_WINRT
 }
 
-int qt_msectime()
+quint64 qt_msectime()
 {
     return ticksToNanoseconds(getTickCount()) / 1000000;
 }