--- a/src/hotspot/share/runtime/arguments.cpp	Tue Nov 26 17:00:57 2019 +0100
+++ b/src/hotspot/share/runtime/arguments.cpp	Wed Nov 27 10:19:45 2019 +0100
@@ -528,6 +528,7 @@
   { "CompactFields",                JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
   { "MonitorBound",                 JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
   { "G1RSetScanBlockSize",          JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
+  { "UseParallelOldGC",             JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
 
   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
   { "DefaultMaxRAMFraction",        JDK_Version::jdk(8),  JDK_Version::undefined(), JDK_Version::undefined() },