diff --git a/degesch.c b/degesch.c
index 17965ef..5392092 100644
--- a/degesch.c
+++ b/degesch.c
@@ -1217,10 +1217,10 @@ app_context_init (struct app_context *self)
 
 	str_map_init (&self->servers);
 	self->servers.free = server_destroy;
-	self->servers.key_xfrm = irc_strxfrm;
+	self->servers.key_xfrm = tolower_ascii_strxfrm;
 
 	str_map_init (&self->buffers_by_name);
-	self->buffers_by_name.key_xfrm = irc_strxfrm;
+	self->buffers_by_name.key_xfrm = tolower_ascii_strxfrm;
 
 	self->last_displayed_msg_time = time (NULL);