diff --git a/common/cmd_sf.c b/common/cmd_sf.c
index 11a491d..27d6e39 100644
--- a/common/cmd_sf.c
+++ b/common/cmd_sf.c
@@ -53,7 +53,7 @@
 		return -1;
 
 	if (round_up_len && flash->sector_size > 0)
-		*len = ROUND(len_arg - 1, flash->sector_size);
+		*len = ROUND(len_arg, flash->sector_size);
 	else
 		*len = len_arg;