diff --git a/include/osmocom/msc/vlr_sgs.h b/include/osmocom/msc/vlr_sgs.h
index cc07807..1cbb771 100644
--- a/include/osmocom/msc/vlr_sgs.h
+++ b/include/osmocom/msc/vlr_sgs.h
@@ -26,6 +26,9 @@
 struct vlr_subscr;
 struct vlr_instance;
 
+#define VSUB_USE_SGS "SGs"
+#define VSUB_USE_SGS_PAGING "SGs-paging"
+
 /* See also 3GPP TS 29.118, chapter 4.2.2 States at the VLR */
 enum sgs_ue_fsm_state {
 	SGS_UE_ST_NULL,