--- a/src/hotspot/os/aix/os_aix.hpp	Tue Oct 17 20:21:50 2017 -0400
+++ b/src/hotspot/os/aix/os_aix.hpp	Thu Sep 07 15:40:20 2017 +0200
@@ -139,9 +139,6 @@
   // libpthread version string
   static void libpthread_init();
 
-  // Return default libc guard size for the specified thread type.
-  static size_t default_guard_size(os::ThreadType thr_type);
-
   // Function returns true if we run on OS/400 (pase), false if we run
   // on AIX.
   static bool on_pase() {