diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 9cb4470e02c..5edc7223b19 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -1635,6 +1635,7 @@ QCocoaNSWindow *QCocoaWindow::createNSWindow(bool shouldBePanel)
 
     nsWindow.restorable = NO;
     nsWindow.level = windowLevel(flags);
+    nsWindow.tabbingMode = NSWindowTabbingModeDisallowed;
 
     if (shouldBePanel) {
         // Qt::Tool windows hide on app deactivation, unless Qt::WA_MacAlwaysShowToolWindow is set