diff --git a/src/plugins/coreplugin/mainwindow.cpp b/src/plugins/coreplugin/mainwindow.cpp
index e28821914f3..26d31844ffc 100644
--- a/src/plugins/coreplugin/mainwindow.cpp
+++ b/src/plugins/coreplugin/mainwindow.cpp
@@ -306,6 +306,9 @@ MainWindow::~MainWindow()
     m_helpManager = 0;
     delete m_variableManager;
     m_variableManager = 0;
+
+    delete m_navigationWidget;
+    m_navigationWidget = 0;
 }
 
 bool MainWindow::init(QString *errorMessage)