diff --git a/libc/include/sys/stat.h b/libc/include/sys/stat.h
index da49e1a..cf0d82d 100644
--- a/libc/include/sys/stat.h
+++ b/libc/include/sys/stat.h
@@ -129,7 +129,7 @@
 extern int    mknod(const char *, mode_t, dev_t);
 extern mode_t umask(mode_t);
 
-#if defined(__BIONIC_FORTIFY)
+#if defined(__BIONIC_FORTIFY) && !defined(__clang__)
 
 extern mode_t __umask_chk(mode_t);
 extern mode_t __umask_real(mode_t)
@@ -146,7 +146,7 @@
   }
   return __umask_chk(mode);
 }
-#endif /* defined(__BIONIC_FORTIFY) */
+#endif /* defined(__BIONIC_FORTIFY) && !defined(__clang__) */
 
 
 #define  stat64    stat