diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index b272b4920b..d4d345f61d 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -1371,6 +1371,12 @@ static QTabletEvent::TabletDevice wacomTabletDevice(NSEvent *theEvent)
     [self tryToPerform:aSelector with:self];
 }
 
+- (void)cancelOperation:(id)sender
+{
+    if (!m_platformWindow || m_platformWindow->windowShouldBehaveAsPanel())
+        [super cancelOperation:sender];
+}
+
 - (void) insertText:(id)aString replacementRange:(NSRange)replacementRange
 {
     Q_UNUSED(replacementRange)