--- a/src/hotspot/share/oops/klass.inline.hpp	Fri Aug 16 09:18:41 2019 +0200
+++ b/src/hotspot/share/oops/klass.inline.hpp	Tue Aug 06 10:48:21 2019 +0200
@@ -29,8 +29,8 @@
 #include "oops/klass.hpp"
 #include "oops/markOop.hpp"
 
-inline void Klass::set_prototype_header(markOop header) {
-  assert(!header->has_bias_pattern() || is_instance_klass(), "biased locking currently only supported for Java instances");
+inline void Klass::set_prototype_header(markWord header) {
+  assert(!header.has_bias_pattern() || is_instance_klass(), "biased locking currently only supported for Java instances");
   _prototype_header = header;
 }