--- a/src/hotspot/share/gc/z/zArguments.cpp	Tue Dec 11 11:29:28 2018 +0100
+++ b/src/hotspot/share/gc/z/zArguments.cpp	Tue Dec 11 11:08:39 2018 +0100
@@ -80,10 +80,6 @@
   FLAG_SET_DEFAULT(UseCompressedOops, false);
   FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
 
-  // ClassUnloading not (yet) supported
-  FLAG_SET_DEFAULT(ClassUnloading, false);
-  FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
-
   // Verification before startup and after exit not (yet) supported
   FLAG_SET_DEFAULT(VerifyDuringStartup, false);
   FLAG_SET_DEFAULT(VerifyBeforeExit, false);