--- a/src/hotspot/share/oops/oop.hpp	Mon Sep 09 16:54:48 2019 -0400
+++ b/src/hotspot/share/oops/oop.hpp	Tue Sep 10 07:42:04 2019 +0200
@@ -40,8 +40,6 @@
 //
 // no virtual functions allowed
 
-extern bool always_do_update_barrier;
-
 // Forward declarations.
 class OopClosure;
 class ScanClosure;