diff --git a/app/widget/viewer/viewer.cpp b/app/widget/viewer/viewer.cpp
index 2a236c55f..9e697bc88 100644
--- a/app/widget/viewer/viewer.cpp
+++ b/app/widget/viewer/viewer.cpp
@@ -322,7 +322,8 @@ void ViewerWidget::SetFullScreen(QScreen *screen)
   }
 
   if (windows_.contains(screen)) {
-    delete windows_.take(screen);
+    ViewerWindow* vw = windows_.take(screen);
+    vw->deleteLater();
     return;
   }