diff --git a/src/solver/optimisation/constraints/ConstraintBuilder.h b/src/solver/optimisation/constraints/ConstraintBuilder.h
index 46deac9575..41b11e182d 100644
--- a/src/solver/optimisation/constraints/ConstraintBuilder.h
+++ b/src/solver/optimisation/constraints/ConstraintBuilder.h
@@ -343,7 +343,7 @@ class ConstraintBuilder
 
     unsigned int hourInWeek_ = 0;
 
-    char operator_;
+    char operator_ = '=';
     double rhs_ = 0;
     int nombreDeTermes_ = 0;
     // ConstraintNamer ConstraintNameManager;