diff --git a/resources/prosody-plugins/mod_auth_token.lua b/resources/prosody-plugins/mod_auth_token.lua
index d83fde6ad..fb0df1a6e 100644
--- a/resources/prosody-plugins/mod_auth_token.lua
+++ b/resources/prosody-plugins/mod_auth_token.lua
@@ -26,8 +26,9 @@ module:hook("bosh-session", function(event)
         local params = formdecode(query);
         session.auth_token = query and params.token or nil;
 
-        -- The room name from the bosh query
+        -- The room name and optional prefix from the bosh query
         session.jitsi_bosh_query_room = params.room;
+        session.jitsi_bosh_query_prefix = params.prefix or "";
     end
 end);
 
diff --git a/resources/prosody-plugins/mod_muc_poltergeist.lua b/resources/prosody-plugins/mod_muc_poltergeist.lua
index 6823b5f6b..e3956a329 100644
--- a/resources/prosody-plugins/mod_muc_poltergeist.lua
+++ b/resources/prosody-plugins/mod_muc_poltergeist.lua
@@ -100,7 +100,7 @@ prosody.events.add_handler("pre-jitsi-authentication", function(session)
     if (session.jitsi_meet_context_user) then
         local room = get_room(
             session.jitsi_bosh_query_room,
-            session.jitsi_meet_domain);
+            session.jitsi_bosh_query_prefix);
 
         if (not room) then
             return nil;