diff --git a/src/osmo-bts-litecell15/lc15_l1_if.c b/src/osmo-bts-litecell15/lc15_l1_if.c
index 0fcd7cf..bf2ecec 100644
--- a/src/osmo-bts-litecell15/lc15_l1_if.c
+++ b/src/osmo-bts-litecell15/lc15_l1_if.c
@@ -250,6 +250,7 @@
 
 	switch (ra_ind->sapi) {
 	case GsmL1_Sapi_Pdtch:
+	case GsmL1_Sapi_Prach:
 		bts_update_tbf_ta("PH-RA", ra_ind->u32Fn, fl1h->trx_no, ra_ind->u8Tn,
 				  qta2ta(ra_ind->measParam.i16BurstTiming), true);
 		break;