diff --git a/src/main/java/org/cbioportal/model/CaseListDataCount.java b/src/main/java/org/cbioportal/model/CaseListDataCount.java
index 645c12282db..218a83ffd3c 100644
--- a/src/main/java/org/cbioportal/model/CaseListDataCount.java
+++ b/src/main/java/org/cbioportal/model/CaseListDataCount.java
@@ -1,6 +1,8 @@
 package org.cbioportal.model;
 
-public class CaseListDataCount {
+import java.io.Serializable;
+
+public class CaseListDataCount implements Serializable {
 
     private String label;
     private String value;