--- a/src/hotspot/share/oops/methodData.hpp	Tue Jul 16 08:56:08 2019 +0200
+++ b/src/hotspot/share/oops/methodData.hpp	Fri Sep 27 07:56:02 2019 -0400
@@ -2011,7 +2011,7 @@
   MethodData(const methodHandle& method, int size, TRAPS);
 public:
   static MethodData* allocate(ClassLoaderData* loader_data, const methodHandle& method, TRAPS);
-  MethodData() : _extra_data_lock(Monitor::leaf, "MDO extra data lock") {}; // For ciMethodData
+  MethodData() : _extra_data_lock(Mutex::leaf, "MDO extra data lock") {}; // For ciMethodData
 
   bool is_methodData() const volatile { return true; }
   void initialize();