diff --git a/nsprpub/pr/include/md/_os2.h b/nsprpub/pr/include/md/_os2.h
index 70cf9450910..70cb895ee7e 100644
--- a/nsprpub/pr/include/md/_os2.h
+++ b/nsprpub/pr/include/md/_os2.h
@@ -59,11 +59,6 @@
 #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
 
 /*