diff --git a/sys/xen/xen-os.h b/sys/xen/xen-os.h
index c982d55dcc9a..7dd9c7e44c38 100644
--- a/sys/xen/xen-os.h
+++ b/sys/xen/xen-os.h
@@ -54,6 +54,7 @@ extern shared_info_t *HYPERVISOR_shared_info;
 extern start_info_t *HYPERVISOR_start_info;
 
 /* XXX: we need to get rid of this and use HYPERVISOR_start_info directly */
+extern struct xenstore_domain_interface *xen_store;
 extern char *console_page;
 
 enum xen_domain_type {