diff --git a/ryu/tests/unit/ofproto/json/of13/4-22-ofp_port_mod.packet.json b/ryu/tests/unit/ofproto/json/of13/4-22-ofp_port_mod.packet.json
index e898735a..ecb8d66f 100644
--- a/ryu/tests/unit/ofproto/json/of13/4-22-ofp_port_mod.packet.json
+++ b/ryu/tests/unit/ofproto/json/of13/4-22-ofp_port_mod.packet.json
@@ -2,7 +2,7 @@
    "OFPPortMod": {
       "advertise": 4096, 
       "config": 0, 
-      "hw_addr": "ABEAABER", 
+      "hw_addr": "00:11:00:00:11:11", 
       "mask": 0, 
       "port_no": 1
    }
diff --git a/ryu/tests/unit/ofproto/json/of13/4-39-ofp_port_status.packet.json b/ryu/tests/unit/ofproto/json/of13/4-39-ofp_port_status.packet.json
index 80d0dcfb..c832eafc 100644
--- a/ryu/tests/unit/ofproto/json/of13/4-39-ofp_port_status.packet.json
+++ b/ryu/tests/unit/ofproto/json/of13/4-39-ofp_port_status.packet.json
@@ -6,7 +6,7 @@
             "config": 0, 
             "curr": 10248, 
             "curr_speed": 5000, 
-            "hw_addr": "8guk0D9w", 
+            "hw_addr": "f2:0b:a4:d0:3f:70", 
             "max_speed": 5000, 
             "name": "UG9ydAcAAAAAAAAAAAAAAA==", 
             "peer": 10248, 
diff --git a/ryu/tests/unit/ofproto/json/of13/4-54-ofp_port_desc_reply.packet.json b/ryu/tests/unit/ofproto/json/of13/4-54-ofp_port_desc_reply.packet.json
index 52662216..00af8e41 100644
--- a/ryu/tests/unit/ofproto/json/of13/4-54-ofp_port_desc_reply.packet.json
+++ b/ryu/tests/unit/ofproto/json/of13/4-54-ofp_port_desc_reply.packet.json
@@ -7,7 +7,7 @@
                "config": 0, 
                "curr": 10248, 
                "curr_speed": 5000, 
-               "hw_addr": "8guk0D9w", 
+               "hw_addr": "f2:0b:a4:d0:3f:70", 
                "max_speed": 5000, 
                "name": "UG9ydDcAAAAAAAAAAAAAAA==", 
                "peer": 10248, 
@@ -22,7 +22,7 @@
                "config": 0, 
                "curr": 10248, 
                "curr_speed": 5000, 
-               "hw_addr": "8gukffjq", 
+               "hw_addr": "f2:0b:a4:7d:f8:ea", 
                "max_speed": 5000, 
                "name": "UG9ydDYAAAAAAAAAAAAAAA==", 
                "peer": 10248,