diff --git a/package/libgluonutil/src/libgluonutil.h b/package/libgluonutil/src/libgluonutil.h
index b33b93e7..34765f6f 100644
--- a/package/libgluonutil/src/libgluonutil.h
+++ b/package/libgluonutil/src/libgluonutil.h
@@ -54,6 +54,7 @@ struct json_object * gluonutil_wrap_and_free_string(char *str);
 
 bool gluonutil_has_domains(void);
 char * gluonutil_get_domain(void);
+char * gluonutil_get_primary_domain(void);
 struct json_object * gluonutil_load_site_config(void);
 
 #endif /* _LIBGLUON_LIBGLUON_H_ */