diff --git a/srsenb/src/stack/mac/sched_carrier.cc b/srsenb/src/stack/mac/sched_carrier.cc
index 783fe9895..9a00dde14 100644
--- a/srsenb/src/stack/mac/sched_carrier.cc
+++ b/srsenb/src/stack/mac/sched_carrier.cc
@@ -323,6 +323,9 @@ const cc_sched_result& sched::carrier_sched::generate_tti_result(tti_point tti_r
 
   /* Schedule PHICH */
   for (auto& ue_pair : *ue_db) {
+    if (cc_result->ul_sched_result.nof_phich_elems >= MAX_PHICH_LIST) {
+      break;
+    }
     tti_sched->alloc_phich(&ue_pair.second, &cc_result->ul_sched_result);
   }
 
diff --git a/srsenb/src/stack/mac/sched_grid.cc b/srsenb/src/stack/mac/sched_grid.cc
index fe0b48903..be53294ba 100644
--- a/srsenb/src/stack/mac/sched_grid.cc
+++ b/srsenb/src/stack/mac/sched_grid.cc
@@ -879,6 +879,10 @@ alloc_outcome_t sf_sched::alloc_ul_user(sched_ue* user, prb_interval alloc)
 
 bool sf_sched::alloc_phich(sched_ue* user, sched_interface::ul_sched_res_t* ul_sf_result)
 {
+  if (ul_sf_result->nof_phich_elems >= sched_interface::MAX_PHICH_LIST) {
+    Warning("SCHED: Maximum number of PHICH allocations has been reached\n");
+    return false;
+  }
   using phich_t    = sched_interface::ul_sched_phich_t;
   auto& phich_list = ul_sf_result->phich[ul_sf_result->nof_phich_elems];