diff --git a/jsprit-core/src/main/java/basics/VehicleRoutingProblem.java b/jsprit-core/src/main/java/basics/VehicleRoutingProblem.java
index 4ee8a0c6..0fc612f2 100644
--- a/jsprit-core/src/main/java/basics/VehicleRoutingProblem.java
+++ b/jsprit-core/src/main/java/basics/VehicleRoutingProblem.java
@@ -238,7 +238,7 @@ public class VehicleRoutingProblem {
 		 * @param type
 		 * @return builder
 		 */
-		public Builder addVehicleType(VehicleTypeImpl type){
+		public Builder addVehicleType(VehicleType type){
 			vehicleTypes.add(type);
 			return this;
 		}