diff --git a/src/Gui/NotificationBox.cpp b/src/Gui/NotificationBox.cpp
index 79e528d069..3699a37593 100644
--- a/src/Gui/NotificationBox.cpp
+++ b/src/Gui/NotificationBox.cpp
@@ -246,6 +246,11 @@ bool NotificationLabel::eventFilter(QObject* o, QEvent* e)
                 return insideclick;
             }
         }
+        break;
+        case QEvent::WindowDeactivate:
+            hideNotificationImmediately();
+            break;
+
         default:
             break;
     }