diff --git a/src/widgets/widgets/qmdisubwindow.cpp b/src/widgets/widgets/qmdisubwindow.cpp
index 1ade3caf28f..87c9b1702e9 100644
--- a/src/widgets/widgets/qmdisubwindow.cpp
+++ b/src/widgets/widgets/qmdisubwindow.cpp
@@ -2240,6 +2240,7 @@ QMdiSubWindow::~QMdiSubWindow()
     d->removeButtonsFromMenuBar();
 #endif
     d->setActive(false);
+    delete d->controlContainer;
 }
 
 /*!