diff --git a/maubot.yaml b/maubot.yaml
index 9daa5ee..0cae5e1 100644
--- a/maubot.yaml
+++ b/maubot.yaml
@@ -1,6 +1,6 @@
 maubot: 0.1.0
 id: nl.roomsoverview
-version: 2.0.3
+version: 2.0.4
 license: MIT
 modules:
   - roomsoverview
diff --git a/roomsoverview.mbp b/roomsoverview.mbp
index bfd5846..7bbdbb1 100644
Binary files a/roomsoverview.mbp and b/roomsoverview.mbp differ
diff --git a/roomsoverview.py b/roomsoverview.py
index 4e0a48c..63023b4 100644
--- a/roomsoverview.py
+++ b/roomsoverview.py
@@ -189,10 +189,11 @@ class RoomsOverviewPlugin(Plugin):
 
     async def _resolve_alias(self, alias: str) -> Optional[str]:
         """Los een #alias op naar een room_id."""
-        a = alias.lstrip("#")
+        # De homeserver verwacht de alias inclusief '#', URL-gecodeerd (%23…);
+        # zonder '#' geeft Synapse "Room alias invalid" (M_INVALID_PARAM).
         try:
             async with self.http.get(
-                f"{self._base_url()}/_matrix/client/v3/directory/room/{quote(a, safe='')}",
+                f"{self._base_url()}/_matrix/client/v3/directory/room/{quote(alias, safe='')}",
                 headers=self._headers(),
                 timeout=_REQUEST_TIMEOUT,
             ) as r: