diff --git a/src/plugins/platforms/cocoa/qcocoawindow.h b/src/plugins/platforms/cocoa/qcocoawindow.h
index deba861fcc..e992263c82 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.h
+++ b/src/plugins/platforms/cocoa/qcocoawindow.h
@@ -91,6 +91,7 @@ QT_NAMESPACE_ALIAS_OBJC_CLASS(QNSWindowHelper);
 @interface QT_MANGLE_NAMESPACE(QNSWindow) : NSWindow<QNSWindowProtocol>
 {
     QNSWindowHelper *_helper;
+    bool _closed;
 }
 
 @property (nonatomic, readonly) QNSWindowHelper *helper;
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 6ef459566a..7d41562863 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -303,6 +303,14 @@ - (void)closeAndRelease
     }
 }
 
+- (void)close
+{
+    if (!_closed) {
+        _closed = true;
+        [super close];
+    }
+}
+
 - (void)dealloc
 {
     [_helper clearWindow];
@@ -612,6 +620,7 @@ static void qRegisterNotificationCallbacks()
     });
 
     [m_view release];
+    [m_nsWindow close];
     [m_nsWindow release];
     [m_windowCursor release];
 }