diff --git a/napalm_vyos/vyos.py b/napalm_vyos/vyos.py
index c2d87d8..670f4bb 100644
--- a/napalm_vyos/vyos.py
+++ b/napalm_vyos/vyos.py
@@ -349,6 +349,7 @@ class VyOSDriver(NetworkDriver):
                     "is_enabled": bool(is_enabled),
                     "description": py23_compat.text_type(description),
                     "last_flapped": float(-1),
+                    "mtu": -1,
                     "speed": int(speed),
                     "mac_address": py23_compat.text_type(hw_id)
                   }
diff --git a/test/unit/mocked_data/test_get_interfaces/normal/expected_result.json b/test/unit/mocked_data/test_get_interfaces/normal/expected_result.json
index d4bf26f..2df2314 100644
--- a/test/unit/mocked_data/test_get_interfaces/normal/expected_result.json
+++ b/test/unit/mocked_data/test_get_interfaces/normal/expected_result.json
@@ -1 +1 @@
-{"lo": {"is_enabled": true, "description": "", "last_flapped": -1.0, "is_up": true, "mac_address": "00:00:00:00:00:00", "speed": 0}, "eth1": {"is_enabled": true, "description": "", "last_flapped": -1.0, "is_up": true, "mac_address": "...", "speed": 0}, "eth0": {"is_enabled": true, "description": "", "last_flapped": -1.0, "is_up": true, "mac_address": "...", "speed": 0}}
+{"lo": {"is_enabled": true, "description": "", "last_flapped": -1.0, "is_up": true, "mac_address": "00:00:00:00:00:00", "mtu": -1, "speed": 0}, "eth1": {"is_enabled": true, "description": "", "last_flapped": -1.0, "is_up": true, "mac_address": "...", "mtu": -1, "speed": 0}, "eth0": {"is_enabled": true, "description": "", "last_flapped": -1.0, "is_up": true, "mac_address": "...", "mtu": -1, "speed": 0}}