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-rw-r--r--changelog.d/11900.misc1
-rw-r--r--synapse/event_auth.py6
2 files changed, 4 insertions, 3 deletions
diff --git a/changelog.d/11900.misc b/changelog.d/11900.misc
new file mode 100644
index 0000000000..edd2852fd4
--- /dev/null
+++ b/changelog.d/11900.misc
@@ -0,0 +1 @@
+Remove unnecessary condition on knock->leave auth rule check.
\ No newline at end of file
diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index eca00bc975..621a3efccc 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -374,9 +374,9 @@ def _is_membership_change_allowed(
         return
 
     # Require the user to be in the room for membership changes other than join/knock.
-    if Membership.JOIN != membership and (
-        RoomVersion.msc2403_knocking and Membership.KNOCK != membership
-    ):
+    # Note that the room version check for knocking is done implicitly by `caller_knocked`
+    # and the ability to set a membership of `knock` in the first place.
+    if Membership.JOIN != membership and Membership.KNOCK != membership:
         # If the user has been invited or has knocked, they are allowed to change their
         # membership event to leave
         if (