diff --git a/fs/jffs2/summary.c b/fs/jffs2/summary.c
index 7b0ed77a4c3577c8c0203b5a17d92b7dcbec01d8..48293c197f13d942a2c5171af5877b81479b3127 100644
--- a/fs/jffs2/summary.c
+++ b/fs/jffs2/summary.c
@@ -655,7 +655,7 @@ static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock
 
 
 	if (ret || (retlen != infosize)) {
-		JFFS2_WARNING("Write of %d bytes at 0x%08x failed. returned %d, retlen %zu\n",
+		JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
 			infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);
 
 		c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;