diff --git a/ryu/tests/unit/ofproto/json/of13/4-50-ofp_meter_stats_reply.packet.json b/ryu/tests/unit/ofproto/json/of13/4-50-ofp_meter_stats_reply.packet.json
index 50d295cc..b4fd8226 100644
--- a/ryu/tests/unit/ofproto/json/of13/4-50-ofp_meter_stats_reply.packet.json
+++ b/ryu/tests/unit/ofproto/json/of13/4-50-ofp_meter_stats_reply.packet.json
@@ -15,7 +15,7 @@
                "duration_nsec": 480000, 
                "duration_sec": 0, 
                "flow_count": 0, 
-               "len": 56,
+               "len": 56, 
                "meter_id": 100, 
                "packet_in_count": 0
             }