diff --git a/src/json.c b/src/json.c
index 8e6288e..6063771 100644
--- a/src/json.c
+++ b/src/json.c
@@ -873,7 +873,7 @@
 	    if (top_item != NULL && top_item->jd_type == JSON_OBJECT_KEY
 		    && cur_item != NULL)
 	    {
-		top_item->jd_key = get_tv_string_buf_chk(cur_item, key_buf);
+		top_item->jd_key = tv_get_string_buf_chk(cur_item, key_buf);
 		if (top_item->jd_key == NULL)
 		{
 		    clear_tv(cur_item);