diff --git a/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleTypeImpl.java b/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleTypeImpl.java
index 16070250..fcdd8162 100644
--- a/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleTypeImpl.java
+++ b/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleTypeImpl.java
@@ -210,7 +210,6 @@ public class VehicleTypeImpl implements VehicleType {
         }
 
         public VehicleTypeImpl.Builder setCostPerServiceTime(double perServiceTime) {
-            if (perServiceTime < 0.0) throw new IllegalStateException();
             this.perServiceTime = perServiceTime;
             return this;
         }