diff --git a/changelog.d/7630.feature b/changelog.d/7630.feature
new file mode 100644
index 0000000000..cce31fc881
--- /dev/null
+++ b/changelog.d/7630.feature
@@ -0,0 +1 @@
+Support the standardized `m.login.sso` user-interactive authentication flow.
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index d323b0b9b3..5ec4a77ccd 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -61,7 +61,7 @@ class LoginType(object):
     MSISDN = "m.login.msisdn"
     RECAPTCHA = "m.login.recaptcha"
     TERMS = "m.login.terms"
-    SSO = "org.matrix.login.sso"
+    SSO = "m.login.sso"
     DUMMY = "m.login.dummy"