diff --git a/library/cadbiom/models/clause_constraints/mcl/CLUnfolder.py b/library/cadbiom/models/clause_constraints/mcl/CLUnfolder.py
index bc98ddd2535c851f7aa1959ebbf10e469dea2835..08e1c132a32a5fa005ca8744c7deee8ee96ca114 100644
--- a/library/cadbiom/models/clause_constraints/mcl/CLUnfolder.py
+++ b/library/cadbiom/models/clause_constraints/mcl/CLUnfolder.py
@@ -469,7 +469,7 @@ class CLUnfolder(object):
     @property
     def final_constraints(self):
         """For tests: returns coded final constraints"""
-        self.__final_constraints
+        return self.__final_constraints
 
     ## Variables management ####################################################
     def var_names_in_clause(self, clause):