diff --git a/jsprit-core/src/main/java/algorithms/BestInsertionBuilder.java b/jsprit-core/src/main/java/algorithms/BestInsertionBuilder.java
index b13773ff..d2efe07e 100644
--- a/jsprit-core/src/main/java/algorithms/BestInsertionBuilder.java
+++ b/jsprit-core/src/main/java/algorithms/BestInsertionBuilder.java
@@ -9,7 +9,7 @@ import basics.algo.InsertionListener;
 import basics.algo.VehicleRoutingAlgorithmListeners.PrioritizedVRAListener;
 import basics.route.VehicleFleetManager;
 
-public class BestInsertionBuilder implements InsertionStrategyBuilder{
+public class BestInsertionBuilder {
 
 	private VehicleRoutingProblem vrp;
 	
@@ -101,7 +101,7 @@ public class BestInsertionBuilder implements InsertionStrategyBuilder{
 		this.actInsertionCostsCalculator = activityInsertionCostsCalculator;
 	};
 	
-	@Override
+
 	public InsertionStrategy build() {
 		List<InsertionListener> iListeners = new ArrayList<InsertionListener>();
 		List<PrioritizedVRAListener> algorithmListeners = new ArrayList<PrioritizedVRAListener>();
diff --git a/jsprit-core/src/main/java/algorithms/InsertionStrategyBuilder.java b/jsprit-core/src/main/java/algorithms/InsertionStrategyBuilder.java
deleted file mode 100644
index 04e34208..00000000
--- a/jsprit-core/src/main/java/algorithms/InsertionStrategyBuilder.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package algorithms;
-
-public interface InsertionStrategyBuilder {
-	
-	public InsertionStrategy build();
-
-}