diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index abb6e86..eeabc0f 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -899,7 +899,7 @@
 		     bts->network->network_code, bts->location_area_code);
 
 	mid = msgb_put(msg, GSM48_MID_TMSI_LEN);
-	generate_mid_from_tmsi(mid, tmsi);
+	gsm48_generate_mid_from_tmsi(mid, tmsi);
 
 	DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n");