diff --git a/packages/gecode/clp_examples/sudoku.yap b/packages/gecode/clp_examples/sudoku.yap
index a6ff99c3b..08a8230ac 100644
--- a/packages/gecode/clp_examples/sudoku.yap
+++ b/packages/gecode/clp_examples/sudoku.yap
@@ -6,7 +6,8 @@
 :- use_module(library(maplist)).
 
 main :-
-    sudoku(Ex, Els),
+    ex(Ex, _),
+    sudoku(Ex, _My),
 	fail.
 main.