diff --git a/Core/src/org/sleuthkit/autopsy/commonfilesearch/CommonFilesNode.java b/Core/src/org/sleuthkit/autopsy/commonfilesearch/CommonFilesNode.java
index ff52d8e19e..e6d8c26995 100644
--- a/Core/src/org/sleuthkit/autopsy/commonfilesearch/CommonFilesNode.java
+++ b/Core/src/org/sleuthkit/autopsy/commonfilesearch/CommonFilesNode.java
@@ -30,7 +30,7 @@ import org.sleuthkit.datamodel.AbstractFile;
  */
 class CommonFilesNode extends AbstractNode {
     
-    private CommonFilesChildren children;
+    private final CommonFilesChildren children;
     
     public CommonFilesNode(List<AbstractFile> keys) {
         super(new CommonFilesChildren(true, keys));