diff --git a/console-server.h b/console-server.h
index bd287c8..5343af8 100644
--- a/console-server.h
+++ b/console-server.h
@@ -209,6 +209,8 @@
 struct config;
 const char *config_get_value(struct config *config, const char *name);
 struct config *config_init(const char *filename);
+const char *config_resolve_console_id(struct config *config,
+				      const char *id_arg);
 void config_fini(struct config *config);
 
 int config_parse_baud(speed_t *speed, const char *baud_string);