diff --git a/src/synapse/authProvider.js b/src/synapse/authProvider.js
index 723f1550..2c3a9be1 100644
--- a/src/synapse/authProvider.js
+++ b/src/synapse/authProvider.js
@@ -24,6 +24,10 @@ const authProvider = {
                 type: "m.login.password",
                 user: username,
                 password: password,
+                identifier: {
+                  type: "m.id.user",
+                  user: username,
+                },
               }
         )
       ),