diff -r f0312c7d5b37 -r ba6c248cae19 src/hotspot/cpu/zero/globals_zero.hpp
--- a/src/hotspot/cpu/zero/globals_zero.hpp	Wed Nov 13 11:21:15 2019 +0100
+++ b/src/hotspot/cpu/zero/globals_zero.hpp	Wed Nov 13 11:37:29 2019 +0100
@@ -66,9 +66,6 @@
 define_pd_global(bool,  RewriteBytecodes,     true);
 define_pd_global(bool,  RewriteFrequentPairs, true);
 
-// GC Ergo Flags
-define_pd_global(size_t, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread
-
 define_pd_global(uintx, TypeProfileLevel, 0);
 
 define_pd_global(bool, PreserveFramePointer, false);