diff --git a/src/main/java/org/apache/commons/math/stat/descriptive/summary/Sum.java b/src/main/java/org/apache/commons/math/stat/descriptive/summary/Sum.java
index 34b2a12fb..b8e6b22f0 100644
--- a/src/main/java/org/apache/commons/math/stat/descriptive/summary/Sum.java
+++ b/src/main/java/org/apache/commons/math/stat/descriptive/summary/Sum.java
@@ -19,7 +19,6 @@ package org.apache.commons.math.stat.descriptive.summary;
 import java.io.Serializable;
 
 import org.apache.commons.math.stat.descriptive.AbstractStorelessUnivariateStatistic;
-import org.apache.commons.math.stat.descriptive.WeightedEvaluation;
 
 
 /**