--- old/make/RunTestsPrebuiltSpec.gmk	2018-04-09 14:09:31.372000370 +0200
+++ new/make/RunTestsPrebuiltSpec.gmk	2018-04-09 14:09:30.612952351 +0200
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -77,6 +77,7 @@
 ################################################################################
 # Set some reasonable defaults for features
 DEBUG_LEVEL := release
+ENABLE_JFR := true
 HOTSPOT_DEBUG_LEVEL := release
 BUILD_GTEST := true
 BUILD_FAILURE_HANDLER := true