diff --git a/compiler/tests/org/jetbrains/jet/test/util/NamespaceComparator.java b/compiler/tests/org/jetbrains/jet/test/util/NamespaceComparator.java
index 0f7ad6edcbf..96435ae1283 100644
--- a/compiler/tests/org/jetbrains/jet/test/util/NamespaceComparator.java
+++ b/compiler/tests/org/jetbrains/jet/test/util/NamespaceComparator.java
@@ -728,12 +728,18 @@ public class NamespaceComparator {
         }
     }
 
+    private static final MethodCache CLASS_OBJECT_SERIALIZER_METHOD_CACHE = new MethodCache(ClassObjectSerializer.class);
     private class ClassObjectSerializer extends FullContentSerialier {
 
         private ClassObjectSerializer(StringBuilder sb) {
             super(sb);
         }
 
+        @Override
+        protected MethodCache doGetMethodCache() {
+            return CLASS_OBJECT_SERIALIZER_METHOD_CACHE;
+        }
+
         @Override
         public void serialize(ClassKind kind) {
             assert kind == ClassKind.OBJECT : "Must be called for class objects only";