1 files changed, 1 insertions, 1 deletions
diff --git a/src/jrummikub/ai/fdsolver/constraint/IfConstraint.java b/src/jrummikub/ai/fdsolver/constraint/IfConstraint.java
index 802acc2..3046eb5 100644
--- a/src/jrummikub/ai/fdsolver/constraint/IfConstraint.java
+++ b/src/jrummikub/ai/fdsolver/constraint/IfConstraint.java
@@ -11,7 +11,7 @@ import jrummikub.ai.fdsolver.Propagator;
 import jrummikub.ai.fdsolver.Satisfiability;
 import jrummikub.ai.fdsolver.Var;
 
-public class IfConstraint implements Constraint {
+public class IfConstraint extends Constraint {
 	Var<Boolean> condition;
 	Constraint child;
 	Collection<Var<?>> vars;