diff --git a/lucene/queries/src/java/org/apache/lucene/queries/function/ValueSource.java b/lucene/queries/src/java/org/apache/lucene/queries/function/ValueSource.java
index 30a1913..5c9708a 100644
--- a/lucene/queries/src/java/org/apache/lucene/queries/function/ValueSource.java
+++ b/lucene/queries/src/java/org/apache/lucene/queries/function/ValueSource.java
@@ -38,7 +38,7 @@ import java.util.Map;
  *
  *
  */
-public abstract class ValueSource implements Serializable {
+public abstract class ValueSource {
 
   /**
    * Gets the values for this reader and the context that was previously