diff --git a/src/ir_decoder/src/ir_ac_parse_parameter.c b/src/ir_decoder/src/ir_ac_parse_parameter.c
index 77cc351..2752aae 100644
--- a/src/ir_decoder/src/ir_ac_parse_parameter.c
+++ b/src/ir_decoder/src/ir_ac_parse_parameter.c
@@ -1137,7 +1137,7 @@ INT8 parse_swing_info(struct tag_head *tag, t_swing_info *si)
     // count how many swing types are there
     si->type = SWING_TYPE_NORMAL;
     si->mode_count = 1;
-    for (i = 0; i < tag->len; i++) 
+    for (int i = 0; i < tag->len; i++)
     {
         if (tag->p_data[i] == ',') 
         {