--- a/src/player_client.c	2015-10-14 21:19:05.347505352 +0200
+++ b/src/player_client.c	2015-10-14 21:19:22.057195175 +0200
@@ -33,7 +33,7 @@
 {
   player->nick[0] = g_string_new (config->player_name->str);
 
-  g_printerr (player->nick[0]->str);
+  g_printerr ("%s", player->nick[0]->str);
 
   return (0);
 }