diff --git a/lcl/interfaces/gtk/gtklistsl.inc b/lcl/interfaces/gtk/gtklistsl.inc
index d6433e2728..bf3a112084 100644
--- a/lcl/interfaces/gtk/gtklistsl.inc
+++ b/lcl/interfaces/gtk/gtklistsl.inc
@@ -418,6 +418,7 @@ begin
     ChildWidget := PPointer(PGTKBox(PGtkBin(AItem)^.child)^.Children^.Data)^;
     gtk_signal_disconnect_by_func(
       PGtkObject(ChildWidget), TGTKSignalFunc(@gtkListItemToggledCB), AItem);
+    FreeWidgetInfo(ChildWidget);
   end;
 end;