diff --git a/src/plugins/platforms/cocoa/qnswindow.mm b/src/plugins/platforms/cocoa/qnswindow.mm
index d9158bbcaea..27d98a3b73d 100644
--- a/src/plugins/platforms/cocoa/qnswindow.mm
+++ b/src/plugins/platforms/cocoa/qnswindow.mm
@@ -106,7 +106,7 @@ static bool isMouseEvent(NSEvent *ev)
 
     // Unfortunately there's no NSWindowListOrderedBackToFront,
     // so we have to manually reverse the order using an array.
-    NSMutableArray<NSWindow *> *windows = [NSMutableArray<NSWindow *> new];
+    NSMutableArray<NSWindow *> *windows = [[NSMutableArray<NSWindow *> new] autorelease];
     [application enumerateWindowsWithOptions:NSWindowListOrderedFrontToBack
         usingBlock:^(NSWindow *window, BOOL *) {
             // For some reason AppKit will give us nil-windows, skip those