diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 048663122863..8e3c80802bcd 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -984,13 +984,13 @@ static struct dm_dirty_log *create_dirty_log(struct dm_target *ti,
 		return NULL;
 	}
 
-	*args_used = 2 + param_count;
-
-	if (argc < *args_used) {
+	if (param_count > argc - 2) {
 		ti->error = "Insufficient mirror log arguments";
 		return NULL;
 	}
 
+	*args_used = 2 + param_count;
+
 	dl = dm_dirty_log_create(argv[0], ti, mirror_flush, param_count,
 				 argv + 2);
 	if (!dl) {