diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index e55e24a7ad..5e91f56ce6 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -162,6 +162,7 @@ sub thread_cleanup {
     *Slic3r::TriangleMesh::DESTROY          = sub {};
     *Slic3r::GUI::AppConfig::DESTROY        = sub {};
     *Slic3r::GUI::PresetBundle::DESTROY     = sub {};
+    *Slic3r::GUI::Tab::DESTROY              = sub {};
     return undef;  # this prevents a "Scalars leaked" warning
 }