1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py
index b0ff5e1ead..90940ff185 100644
--- a/synapse/rest/admin/users.py
+++ b/synapse/rest/admin/users.py
@@ -420,6 +420,9 @@ class UserRegisterServlet(RestServlet):
         if user_type is not None and user_type not in UserTypes.ALL_USER_TYPES:
             raise SynapseError(400, "Invalid user type")
 
+        if "mac" not in body:
+            raise SynapseError(400, "mac must be specified", errcode=Codes.BAD_JSON)
+
         got_mac = body["mac"]
 
         want_mac_builder = hmac.new(