diff --git a/pl/init.yap b/pl/init.yap
index 7123b3a54..31085f9fd 100644
--- a/pl/init.yap
+++ b/pl/init.yap
@@ -206,5 +206,5 @@ file_search_path(system, Dir) :-
 	prolog_flag(host_type, Dir).
 file_search_path(foreign, yap('lib/Yap')).
 
-%:- yap_flag(unknown,error). 
+:- yap_flag(unknown,error).