diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 3ffde0d7fc83cb57c6bd3f57e76d70690573b8a3..f29bce560ca99b7aa81532be3df518eb061e1f42 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -122,7 +122,8 @@ class UserTypes(object):
     """
 
     SUPPORT = "support"
-    ALL_USER_TYPES = (SUPPORT,)
+    BOT = "bot"
+    ALL_USER_TYPES = (SUPPORT, BOT)
 
 
 class RelationTypes(object):