diff -r 50b86b3974ae -r b6a8e9658abd src/hotspot/share/runtime/arguments.cpp
--- a/src/hotspot/share/runtime/arguments.cpp	Fri Dec 15 16:51:13 2017 +0100
+++ b/src/hotspot/share/runtime/arguments.cpp	Mon Dec 18 12:11:01 2017 +0100
@@ -497,7 +497,7 @@
   { "MaxRAMFraction",               JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
   { "MinRAMFraction",               JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
   { "InitialRAMFraction",           JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
-  { "UseMembar",                    JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
+  { "UseMembar",                    JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
   { "FastTLABRefill",               JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "SafepointSpinBeforeYield",     JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "DeferThrSuspendLoopCount",     JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },