diff --git a/qcocoawindow.mm b/qcocoawindow.mm
index 0e5655f..6ab3a21 100644
--- a/qcocoawindow.mm
+++ b/qcocoawindow.mm
@@ -272,7 +272,7 @@ static bool isMouseEvent(NSEvent *ev)
 + (void)applicationActivationChanged:(NSNotification*)notification
 {
     const id sender = self;
-    NSEnumerator *windowEnumerator = nullptr;
+    NSEnumerator *windowEnumerator = Q_NULLPTR;
     NSApplication *application = [NSApplication sharedApplication];
 
 #if QT_OSX_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_12)
@@ -313,7 +313,7 @@ static bool isMouseEvent(NSEvent *ev)
             continue;
 
         if ([window conformsToProtocol:@protocol(QNSWindowProtocol)]) {
-            QCocoaWindow *cocoaWindow = static_cast<id<QNSWindowProtocol>>(window).helper.platformWindow;
+            QCocoaWindow *cocoaWindow = static_cast< id<QNSWindowProtocol> >(window).helper.platformWindow;
             window.level = notification.name == NSApplicationWillResignActiveNotification ?
                 NSNormalWindowLevel : cocoaWindow->windowLevel(cocoaWindow->window()->flags());
         }