diff --git i/src/plugins/platforms/cocoa/qnsview.mm w/src/plugins/platforms/cocoa/qnsview.mm
index 296b6a28cc..ce0ed24403 100644
--- i/src/plugins/platforms/cocoa/qnsview.mm
+++ w/src/plugins/platforms/cocoa/qnsview.mm
@@ -374,6 +374,8 @@ static bool _q_dontOverrideCtrlLMB = false;

 - (void) flushBackingStore:(QCocoaBackingStore *)backingStore region:(const QRegion &)region offset:(QPoint)offset
 {
+    QMacAutoReleasePool pool;
+
     qCDebug(lcQpaCocoaWindow) << "[QNSView flushBackingStore:]" << m_platformWindow->window() << region.rectCount() << region.boundingRect() << offset;

     m_backingStore = backingStore;