diff --git a/lucene/test-framework/src/java/org/apache/lucene/search/similarities/AssertingSimilarity.java b/lucene/test-framework/src/java/org/apache/lucene/search/similarities/AssertingSimilarity.java
index c448312addb..dfe55380cc8 100644
--- a/lucene/test-framework/src/java/org/apache/lucene/search/similarities/AssertingSimilarity.java
+++ b/lucene/test-framework/src/java/org/apache/lucene/search/similarities/AssertingSimilarity.java
@@ -100,7 +100,7 @@ public class AssertingSimilarity extends Similarity {
 
   @Override
   public String toString() {
-    return "Asserting(" + super.toString() + ")";
+    return "Asserting(" + delegate + ")";
   }
 
 }