diff --git a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleUnit.aidl b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleUnit.aidl
index 8a18d4a..9aca98b 100644
--- a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleUnit.aidl
+++ b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleUnit.aidl
@@ -52,6 +52,7 @@
   US_GALLON = 0x42,
   IMPERIAL_GALLON = 0x43,
   NANO_SECS = 0x50,
+  MILLI_SECS = 0x51,
   SECS = 0x53,
   YEAR = 0x59,
   WATT_HOUR = 0x60,
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleUnit.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleUnit.aidl
index 3817b74..d4f9086 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleUnit.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleUnit.aidl
@@ -43,6 +43,7 @@
     US_GALLON = 0x42,
     IMPERIAL_GALLON = 0x43,
     NANO_SECS = 0x50,
+    MILLI_SECS = 0x51,
     SECS = 0x53,
     YEAR = 0x59,
     WATT_HOUR = 0x60,