diff --git a/Source/NSObject.m b/Source/NSObject.m
index 2b6e9fd01..8248c940a 100644
--- a/Source/NSObject.m
+++ b/Source/NSObject.m
@@ -168,7 +168,8 @@ BOOL NSDecrementExtraRefCountWasZero(id anObject)
     {
       for (i=0; i < proto_list->count; i++)
       {
-        if ([proto_list->list[i] conformsToProtocol: aProtocol])
+	/* xxx We should add conformsToProtocol to Protocol class. */
+        if ([proto_list->list[i] conformsTo: aProtocol])
           return YES;
       }
     }