diff --git a/src/ff.c b/src/ff.c
index faac347..86cdf23 100644
--- a/src/ff.c
+++ b/src/ff.c
@@ -3439,6 +3439,7 @@ FRESULT f_open (
 				fp->obj.sclust = ld_dword(fs->dirbuf + XDIR_FstClus);	/* Get object allocation info */
 				fp->obj.objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
 				fp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
+				fp->obj.n_frag = 0;
 			} else
 #endif
 			{