diff --git a/aleksis/apps/matrix/preferences.py b/aleksis/apps/matrix/preferences.py
index 048a5558ee1136d948c00d5f5f0df35d53260dcb..b58b988b8bedb841e109ff9f120f70ac3b15a58f 100644
--- a/aleksis/apps/matrix/preferences.py
+++ b/aleksis/apps/matrix/preferences.py
@@ -13,6 +13,7 @@ class Homeserver(StringPreference):
     section = matrix
     name = "homeserver"
     verbose_name = _("URL of Matrix homeserver")
+    default = ""
 
 
 @site_preferences_registry.register
@@ -20,3 +21,4 @@ class AccessToken(StringPreference):
     section = matrix
     name = "access_token"
     verbose_name = _("Access token to access homeserver")
+    default = ""