diff --git a/pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ASTUserClass.java b/pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ASTUserClass.java
index 4057bbde94..242a83397e 100644
--- a/pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ASTUserClass.java
+++ b/pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ASTUserClass.java
@@ -4,8 +4,9 @@
 package net.sourceforge.pmd.lang.apex.ast;
 
 import apex.jorje.semantic.ast.compilation.UserClass;
+import net.sourceforge.pmd.lang.ast.RootNode;
 
-public class ASTUserClass extends AbstractApexNode<UserClass> {
+public class ASTUserClass extends AbstractApexNode<UserClass> implements RootNode {
     public ASTUserClass(UserClass userClass) {
         super(userClass);
     }