diff -r 5d306df084eb -r 0f2fe7d37d8c src/os/windows/vm/os_windows.inline.hpp
--- a/src/os/windows/vm/os_windows.inline.hpp	Tue Apr 30 14:49:19 2019 +0200
+++ b/src/os/windows/vm/os_windows.inline.hpp	Mon Jun 17 16:41:38 2019 +0100
@@ -65,14 +65,6 @@
   return true;
 }
 
-inline int os::readdir_buf_size(const char *path)
-{
-  /* As Windows doesn't use the directory entry buffer passed to
-     os::readdir() this can be as short as possible */
-
-  return 1;
-}
-
 // Bang the shadow pages if they need to be touched to be mapped.
 inline void os::bang_stack_shadow_pages() {
   // Write to each page of our new frame to force OS mapping.