diff --git a/src/lib/assoc.pl b/src/lib/assoc.pl
index 2ebf1a8e..79e174e6 100644
--- a/src/lib/assoc.pl
+++ b/src/lib/assoc.pl
@@ -63,11 +63,8 @@ Assocs are Key-Value associations implemented as  a balanced binary tree
 @author         R.A.O'Keefe, L.Damas, V.S.Costa and Jan Wielemaker
 */
 
-/*
-:- meta_predicate
-    map_assoc(1, ?),
-    map_assoc(2, ?, ?).
-*/
+:- meta_predicate map_assoc(1, ?).
+:- meta_predicate map_assoc(2, ?, ?).
 
 %!  empty_assoc(?Assoc) is semidet.
 %