diff --git a/homeassistant/components/matrix/__init__.py b/homeassistant/components/matrix/__init__.py
index 76e2630b26e..03772630a9e 100644
--- a/homeassistant/components/matrix/__init__.py
+++ b/homeassistant/components/matrix/__init__.py
@@ -243,7 +243,10 @@ class MatrixBot:
                 room.update_aliases()
                 self._aliases_fetched_for.add(room.room_id)
 
-            if room_id_or_alias in room.aliases:
+            if (
+                room_id_or_alias in room.aliases
+                or room_id_or_alias == room.canonical_alias
+            ):
                 _LOGGER.debug(
                     "Already in room %s (known as %s)", room.room_id, room_id_or_alias
                 )