diff --git a/src/gprs_pcu.h b/src/gprs_pcu.h
index a9e40ea..ca52c30 100644
--- a/src/gprs_pcu.h
+++ b/src/gprs_pcu.h
@@ -134,6 +134,8 @@
 	struct si_cache *si_cache; /* ARFC+BSIC -> CGI PS cache */
 
 	struct osmo_timer_list update_stats_timer; /* Used to update some time_cc stats periodically */
+
+	uint8_t pcu_if_version;
 };