diff --git a/ff.c b/ff.c
index a66cb6d..a374f74 100644
--- a/ff.c
+++ b/ff.c
@@ -833,7 +833,7 @@ FRESULT dir_find (
 /*-----------------------------------------------------------------------*/
 /* Read an object from the directory                                     */
 /*-----------------------------------------------------------------------*/
-#if _FS_MINIMIZE <= 2
+#if (_FS_MINIMIZE < 2) | (!_READONLY)
 static
 FRESULT dir_read (
 	DIR *dj			/* Pointer to the directory object to store read object name */