diff --git a/steam/enums/proto.py b/steam/enums/proto.py
index b547ab5..93ecbcc 100644
--- a/steam/enums/proto.py
+++ b/steam/enums/proto.py
@@ -30,6 +30,7 @@ EAuthSessionGuardType = SteamIntEnum('EAuthSessionGuardType', {
     'DeviceConfirmation': 4,
     'EmailConfirmation': 5,
     'MachineToken': 6,
+    'LegacyMachineAuth': 7
     })
 
 class EAuthSessionSecurityHistory(SteamIntEnum):