diff --git a/pl/init.yap b/pl/init.yap
index ab9d50fac..4c3e0a745 100644
--- a/pl/init.yap
+++ b/pl/init.yap
@@ -204,6 +204,8 @@ yap_hacks:cut_by(CP) :- '$$cut_by'(CP).
 
 :- multifile user:exception/3.
 
+:- dynamic user:exception/3.
+
 file_search_path(library, Dir) :-
 	library_directory(Dir).
 file_search_path(commons, Dir) :-