diff --git a/PreviewHandler.cs b/PreviewHandler.cs
index 9477a52..ae3ceda 100644
--- a/PreviewHandler.cs
+++ b/PreviewHandler.cs
@@ -224,6 +224,7 @@ namespace PreviewToy
                 previews_check_listbox.Items.Remove(previews[processHandle]);
                 previews_check_listbox.EndUpdate();
 
+                previews[processHandle].overlay.Close();
                 previews[processHandle].Close();
                 previews.Remove(processHandle);
             }