diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index 7d7bb7cf4..55824104e 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -364,6 +364,7 @@ sub check_version {
         } else {
             Slic3r::GUI::show_error(undef, "Failed to check for updates. Try later.") if $p{manual};
         }
+        Slic3r::thread_cleanup();
     })->detach;
 }