--- old/test/hotspot/jtreg/runtime/HiddenClasses/GCHiddenClass.java	2020-03-17 11:31:40.000000000 -0700
+++ new/test/hotspot/jtreg/runtime/HiddenClasses/GCHiddenClass.java	2020-03-17 11:31:40.000000000 -0700
@@ -54,7 +54,7 @@
     // GCed on the next cycle
     private PhantomReference<Class<?>> createClass(ReferenceQueue<Class<?>> refQueue) throws Exception {
         Lookup lookup = MethodHandles.lookup();
-        Class<?> cl = lookup.defineHiddenClass(klassbuf, false, NESTMATE, WEAK).lookupClass();
+        Class<?> cl = lookup.defineHiddenClass(klassbuf, false, NESTMATE).lookupClass();
         return new PhantomReference<Class<?>>(cl, refQueue);
     }