diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index c4d2b7f..63d080b 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -273,8 +273,12 @@
 
 #endif
 
-
 size_t ngx_fs_bsize(u_char *name);
 
 
+#define ngx_stderr               STDERR_FILENO
+#define ngx_set_stderr(fd)       dup2(fd, STDERR_FILENO)
+#define ngx_set_stderr_n         "dup2(STDERR_FILENO)"
+
+
 #endif /* _NGX_FILES_H_INCLUDED_ */
diff --git a/src/os/unix/ngx_os.h b/src/os/unix/ngx_os.h
index a83c6ed..a8b6c6d 100644
--- a/src/os/unix/ngx_os.h
+++ b/src/os/unix/ngx_os.h
@@ -54,7 +54,6 @@
 extern ngx_uint_t   ngx_inherited_nonblocking;
 extern ngx_uint_t   ngx_tcp_nodelay_and_tcp_nopush;
 
-#define ngx_stderr_fileno  STDERR_FILENO
 
 #if (NGX_FREEBSD)
 #include <ngx_freebsd.h>