diff --git a/changelog.d/10418.misc b/changelog.d/10418.misc
new file mode 100644
index 0000000000..eed2d8552a
--- /dev/null
+++ b/changelog.d/10418.misc
@@ -0,0 +1 @@
+Convert internal type variable syntax to reflect wider ecosystem use.
\ No newline at end of file
diff --git a/synapse/module_api/__init__.py b/synapse/module_api/__init__.py
index f3c78089b7..5df9349134 100644
--- a/synapse/module_api/__init__.py
+++ b/synapse/module_api/__init__.py
@@ -89,7 +89,7 @@ class ModuleApi:
         self._server_name = hs.hostname
         self._presence_stream = hs.get_event_sources().sources["presence"]
         self._state = hs.get_state_handler()
-        self._clock = hs.get_clock()  # type: Clock
+        self._clock: Clock = hs.get_clock()
         self._send_email_handler = hs.get_send_email_handler()
 
         try: