diff --git a/src/org/jruby/ast/ArgumentNode.java b/src/org/jruby/ast/ArgumentNode.java
index 0c13ad59fee..85baa3e293c 100644
--- a/src/org/jruby/ast/ArgumentNode.java
+++ b/src/org/jruby/ast/ArgumentNode.java
@@ -60,7 +60,7 @@ public NodeType getNodeType() {
     }
     
     public Object accept(NodeVisitor visitor) {
-        throw new RuntimeException("ArgumentNode should never be evaluated");
+        return null;
     }
 
     /**