diff -r 019b3db480f4 -r fd08f5a976e6 src/hotspot/share/classfile/javaClasses.cpp
--- a/src/hotspot/share/classfile/javaClasses.cpp	Thu May 09 12:56:15 2019 -0400
+++ b/src/hotspot/share/classfile/javaClasses.cpp	Thu May 09 12:04:20 2019 -0500
@@ -1738,9 +1738,6 @@
 }
 
 oop java_lang_Thread::park_blocker(oop java_thread) {
-  assert(JDK_Version::current().supports_thread_park_blocker(),
-         "Must support parkBlocker field");
-
   return java_thread->obj_field(_park_blocker_offset);
 }