diff --git a/src/plugins/projectexplorer/session.cpp b/src/plugins/projectexplorer/session.cpp
index 1082c7ea38d8c2d9415db2dab858d94a6bb1a862..5975c38408133ad09473ac5b08c45359cc7614b7 100644
--- a/src/plugins/projectexplorer/session.cpp
+++ b/src/plugins/projectexplorer/session.cpp
@@ -841,6 +841,8 @@ void SessionManager::updateWindowTitle()
     if (isDefaultSession(m_sessionName)) {
         if (Project *currentProject = ProjectExplorerPlugin::instance()->currentProject())
             m_core->editorManager()->setWindowTitleAddition(currentProject->displayName());
+        else
+            m_core->editorManager()->setWindowTitleAddition("");
     } else {
         QString sessionName = m_sessionName;
         if (sessionName.isEmpty())