diff --git a/appservice.py b/appservice.py
index f4e6b2c..e64ff0d 100644
--- a/appservice.py
+++ b/appservice.py
@@ -280,7 +280,7 @@ def delete_message(event, user):
         pass
 
 def get_displayname(userid):
-    url = "http://localhost:8008/_matrix/client/r0/profile/" + userid
+    url = app.config['MATRIX_HOST'] + "/_matrix/client/r0/profile/" + userid
     r = requests.get(url)
     if r.status_code == 200:
         data = json.loads(r.text)