diff --git a/srsue/src/stack/mac/proc_ra.cc b/srsue/src/stack/mac/proc_ra.cc
index 3ce6839f5..4e1f50569 100644
--- a/srsue/src/stack/mac/proc_ra.cc
+++ b/srsue/src/stack/mac/proc_ra.cc
@@ -162,7 +162,7 @@ void ra_proc::state_pdcch_setup()
   phy_interface_mac_lte::prach_info_t info = phy_h->prach_get_info();
   if (info.is_transmitted) {
     ra_tti  = info.tti_ra;
-    ra_rnti = 1 + (ra_tti % 10) + info.f_id;
+    ra_rnti = 1 + (ra_tti % 10) + (10 * info.f_id);
     rInfo("seq=%d, ra-rnti=0x%x, ra-tti=%d, f_id=%d\n", sel_preamble, ra_rnti, info.tti_ra, info.f_id);
     log_h->console("Random Access Transmission: seq=%d, ra-rnti=0x%x\n", sel_preamble, ra_rnti);
     rar_window_st   = ra_tti + 3;