--- a/src/player_client.c	2015-10-21 14:21:04.317896103 +0200
+++ b/src/player_client.c	2015-10-21 14:21:40.001225103 +0200
@@ -38,7 +38,7 @@
 {
   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;
 }