diff --git a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/VehicleRoutingProblem.java b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/VehicleRoutingProblem.java
index 0503fa83..c9c405f7 100644
--- a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/VehicleRoutingProblem.java
+++ b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/VehicleRoutingProblem.java
@@ -187,8 +187,9 @@ public class VehicleRoutingProblem {
         }
 
 
-        public void setJobActivityFactory(JobActivityFactory jobActivityFactory) {
+        public Builder setJobActivityFactory(JobActivityFactory jobActivityFactory) {
             this.jobActivityFactory = jobActivityFactory;
+            return this;
         }
 
         /**