--- a/src/hotspot/os/windows/os_windows.cpp	Tue Aug 20 10:46:23 2019 +0200
+++ b/src/hotspot/os/windows/os_windows.cpp	Tue Aug 20 10:11:53 2019 +0100
@@ -5803,3 +5803,7 @@
   os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
                            NULL, NULL, NULL, NULL);
 }
+
+bool os::supports_map_sync() {
+  return false;
+}