diff --git a/src/hotspot/share/gc/z/zArguments.cpp b/src/hotspot/share/gc/z/zArguments.cpp
index 0e2df88..bb14d4c 100644
--- a/src/hotspot/share/gc/z/zArguments.cpp
+++ b/src/hotspot/share/gc/z/zArguments.cpp
@@ -83,10 +83,6 @@ void ZArguments::initialize() {
   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);