diff --git a/poezio/config.py b/poezio/config.py
index a1f3dd49..d5a81c0e 100644
--- a/poezio/config.py
+++ b/poezio/config.py
@@ -49,6 +49,7 @@ DEFAULT_CONFIG = {
         'custom_host': '',
         'custom_port': '',
         'default_nick': '',
+        'default_muc_service': '',
         'deterministic_nick_colors': True,
         'device_id': '',
         'nick_color_aliases': True,
diff --git a/poezio/core/core.py b/poezio/core/core.py
index 985dcbab..5090a211 100644
--- a/poezio/core/core.py
+++ b/poezio/core/core.py
@@ -877,10 +877,12 @@ class Core:
         contacts to join in.
         """
 
-        # Use config.default_muc as muc component if available, otherwise
-        # find muc component by disco#items-ing the user domain. If not, give
-        # up
-        default_muc = 'chat.cluxia.eu'
+        # Use config.default_muc_service as muc component if available,
+        # otherwise find muc component by disco#items-ing the user domain. If
+        # not, give up
+        default_muc = config.get('default_muc_service')
+        if not default_muc:
+            return
 
         nick = self.own_nick
         room = uuid.uuid4().hex + '@' + default_muc