diff --git a/src/t_zset.c b/src/t_zset.c
index 3a30b84d93d..dbc561a93d1 100644
--- a/src/t_zset.c
+++ b/src/t_zset.c
@@ -1248,7 +1248,7 @@ void zaddGenericCommand(redisClient *c, int flags) {
     if (zobj == NULL) {
         if (xx) goto reply_to_client; /* No key + XX option: nothing to do. */
         if (server.zset_max_ziplist_entries == 0 ||
-            server.zset_max_ziplist_value < sdslen(c->argv[3]->ptr))
+            server.zset_max_ziplist_value < sdslen(c->argv[scoreidx+1]->ptr))
         {
             zobj = createZsetObject();
         } else {