diff --git a/changelog.d/7689.bugfix b/changelog.d/7689.bugfix
new file mode 100644
index 000000000000..10ad4c8c139f
--- /dev/null
+++ b/changelog.d/7689.bugfix
@@ -0,0 +1 @@
+Compare the URI and method during user interactive authentication (instead of the URI twice). Bug introduced in 1.13.0rc1.
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 119678e67ba9..b01124fe4293 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -297,7 +297,7 @@ async def check_auth(
 
         # Convert the URI and method to strings.
         uri = request.uri.decode("utf-8")
-        method = request.uri.decode("utf-8")
+        method = request.method.decode("utf-8")
 
         # If there's no session ID, create a new session.
         if not sid: