diff --git a/jsprit-core/src/main/java/jsprit/core/algorithm/termination/VariationCoefficientTermination.java b/jsprit-core/src/main/java/jsprit/core/algorithm/termination/VariationCoefficientTermination.java
index 9146ddb5..1e6cef92 100644
--- a/jsprit-core/src/main/java/jsprit/core/algorithm/termination/VariationCoefficientTermination.java
+++ b/jsprit-core/src/main/java/jsprit/core/algorithm/termination/VariationCoefficientTermination.java
@@ -47,7 +47,7 @@ import java.util.Collection;
  */
 public class VariationCoefficientTermination implements PrematureAlgorithmTermination, IterationStartsListener, AlgorithmStartsListener, IterationEndsListener{
 
-	private static Logger logger = LogManager.getLogger(VariationCoefficientTermination.class);
+	private final static Logger logger = LogManager.getLogger(VariationCoefficientTermination.class);
 	
 	private final int noIterations;