diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index f9c676a5b0..54254455e4 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -503,7 +503,7 @@ NSUInteger QCocoaWindow::windowStyleMask(Qt::WindowFlags flags)
 {
     const Qt::WindowType type = static_cast<Qt::WindowType>(int(flags & Qt::WindowType_Mask));
     const bool frameless = (flags & Qt::FramelessWindowHint) || windowIsPopupType(type);
-    const bool resizeable = type != Qt::Dialog; // Dialogs: remove zoom button by disabling resize
+    const bool resizeable = !(flags & Qt::CustomizeWindowHint); // Remove zoom button by disabling resize
 
     // Select base window type. Note that the value of NSBorderlessWindowMask is 0.
     NSUInteger styleMask = (frameless || !resizeable) ? NSBorderlessWindowMask : NSResizableWindowMask;