diff --git a/changelog.d/11335.feature b/changelog.d/11335.feature
new file mode 100644
index 000000000..9b6c1b9c2
--- /dev/null
+++ b/changelog.d/11335.feature
@@ -0,0 +1 @@
+Support the stable version of [MSC2778](https://github.com/matrix-org/matrix-doc/pull/2778): the `m.login.application_service` login type. Contributed by @tulir.
diff --git a/synapse/rest/client/login.py b/synapse/rest/client/login.py
index d49a647b0..467444a04 100644
--- a/synapse/rest/client/login.py
+++ b/synapse/rest/client/login.py
@@ -61,7 +61,8 @@ class LoginRestServlet(RestServlet):
     TOKEN_TYPE = "m.login.token"
     JWT_TYPE = "org.matrix.login.jwt"
     JWT_TYPE_DEPRECATED = "m.login.jwt"
-    APPSERVICE_TYPE = "uk.half-shot.msc2778.login.application_service"
+    APPSERVICE_TYPE = "m.login.application_service"
+    APPSERVICE_TYPE_UNSTABLE = "uk.half-shot.msc2778.login.application_service"
     REFRESH_TOKEN_PARAM = "org.matrix.msc2918.refresh_token"
 
     def __init__(self, hs: "HomeServer"):
@@ -143,6 +144,7 @@ class LoginRestServlet(RestServlet):
         flows.extend({"type": t} for t in self.auth_handler.get_supported_login_types())
 
         flows.append({"type": LoginRestServlet.APPSERVICE_TYPE})
+        flows.append({"type": LoginRestServlet.APPSERVICE_TYPE_UNSTABLE})
 
         return 200, {"flows": flows}
 
@@ -159,7 +161,10 @@ class LoginRestServlet(RestServlet):
             should_issue_refresh_token = False
 
         try:
-            if login_submission["type"] == LoginRestServlet.APPSERVICE_TYPE:
+            if login_submission["type"] in (
+                LoginRestServlet.APPSERVICE_TYPE,
+                LoginRestServlet.APPSERVICE_TYPE_UNSTABLE,
+            ):
                 appservice = self.auth.get_appservice_by_req(request)
 
                 if appservice.is_rate_limited():
diff --git a/tests/handlers/test_password_providers.py b/tests/handlers/test_password_providers.py
index 7dd4a5a36..08e9730d4 100644
--- a/tests/handlers/test_password_providers.py
+++ b/tests/handlers/test_password_providers.py
@@ -31,7 +31,10 @@ from tests.unittest import override_config
 
 # (possibly experimental) login flows we expect to appear in the list after the normal
 # ones
-ADDITIONAL_LOGIN_FLOWS = [{"type": "uk.half-shot.msc2778.login.application_service"}]
+ADDITIONAL_LOGIN_FLOWS = [
+    {"type": "m.login.application_service"},
+    {"type": "uk.half-shot.msc2778.login.application_service"},
+]
 
 # a mock instance which the dummy auth providers delegate to, so we can see what's going
 # on
diff --git a/tests/rest/client/test_login.py b/tests/rest/client/test_login.py
index a63f04bd4..0b90e3f80 100644
--- a/tests/rest/client/test_login.py
+++ b/tests/rest/client/test_login.py
@@ -79,7 +79,10 @@ EXPECTED_CLIENT_REDIRECT_URL_PARAMS = [("<ab c>", ""), ('q" =+"', '"fö&=o"')]
 
 # (possibly experimental) login flows we expect to appear in the list after the normal
 # ones
-ADDITIONAL_LOGIN_FLOWS = [{"type": "uk.half-shot.msc2778.login.application_service"}]
+ADDITIONAL_LOGIN_FLOWS = [
+    {"type": "m.login.application_service"},
+    {"type": "uk.half-shot.msc2778.login.application_service"},
+]
 
 
 class LoginRestServletTestCase(unittest.HomeserverTestCase):