diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index d397c2f..1a35cba 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -78,8 +78,25 @@
 
 #if (NGX_HAVE_OPENAT)
 #define NGX_FILE_NOFOLLOW        O_NOFOLLOW
+
+#if defined(O_DIRECTORY)
+#define NGX_FILE_DIRECTORY       O_DIRECTORY
+#else
+#define NGX_FILE_DIRECTORY       0
 #endif
 
+#if defined(O_SEARCH)
+#define NGX_FILE_SEARCH          O_SEARCH|NGX_FILE_DIRECTORY
+
+#elif defined(O_EXEC)
+#define NGX_FILE_SEARCH          O_EXEC|NGX_FILE_DIRECTORY
+
+#else
+#define NGX_FILE_SEARCH          O_RDONLY|NGX_FILE_DIRECTORY
+#endif
+
+#endif /* NGX_HAVE_OPENAT */
+
 #define NGX_FILE_DEFAULT_ACCESS  0644
 #define NGX_FILE_OWNER_ACCESS    0600