diff --git a/mozilla/nsprpub/pr/include/md/_os2.h b/mozilla/nsprpub/pr/include/md/_os2.h
index 6d0170e07a9..bcee5cbcdbe 100644
--- a/mozilla/nsprpub/pr/include/md/_os2.h
+++ b/mozilla/nsprpub/pr/include/md/_os2.h
@@ -43,11 +43,6 @@
 #define sock_errno() errno
 #define soclose close
 #define sock_init()
-
-#include <sys/builtin.h>
-#include <sys/smutex.h>
-static _smutex _md_shm_lock = 0;
-
 #endif
 
 /*