diff --git a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/constraint/MaxDistanceConstraint.java b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/constraint/MaxDistanceConstraint.java
index 9e3f790c..f6896ea8 100644
--- a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/constraint/MaxDistanceConstraint.java
+++ b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/constraint/MaxDistanceConstraint.java
@@ -52,7 +52,7 @@ public class MaxDistanceConstraint implements HardActivityConstraint{
 
     private void makeArray(Map<Vehicle, Double> maxDistances) {
         int maxIndex = getMaxIndex(maxDistances.keySet());
-        this.maxDistances = new Double[maxIndex];
+        this.maxDistances = new Double[maxIndex+1];
         for(Vehicle v : maxDistances.keySet()){
             this.maxDistances[v.getIndex()]=maxDistances.get(v);
         }