1 files changed, 1 insertions, 1 deletions
diff --git a/src/jrummikub/ai/fdsolver/constraint/ComparatorConstraint.java b/src/jrummikub/ai/fdsolver/constraint/ComparatorConstraint.java
index 24e7ecf..ab0edde 100644
--- a/src/jrummikub/ai/fdsolver/constraint/ComparatorConstraint.java
+++ b/src/jrummikub/ai/fdsolver/constraint/ComparatorConstraint.java
@@ -12,7 +12,7 @@ import jrummikub.ai.fdsolver.Propagator;
 import jrummikub.ai.fdsolver.Satisfiability;
 import jrummikub.ai.fdsolver.Var;
 
-public class ComparatorConstraint<T> implements Constraint {
+public class ComparatorConstraint<T> extends Constraint {
 	Var<T> x, y;
 	Comparator<T> comparator, reverseComparator;
 	ComparatorPropagator<T> trueX, trueY, falseX, falseY;