diff --git a/openair1/PHY/MODULATION/slot_fep_nr.c b/openair1/PHY/MODULATION/slot_fep_nr.c
index 6a598582b0..c8ec74d61f 100644
--- a/openair1/PHY/MODULATION/slot_fep_nr.c
+++ b/openair1/PHY/MODULATION/slot_fep_nr.c
@@ -288,6 +288,9 @@ void apply_nr_rotation_RX(NR_DL_FRAME_PARMS *frame_parms,
 			  int first_symbol,
 			  int nsymb)
 {
+  AssertFatal(first_symbol + nsymb <= NR_NUMBER_OF_SYMBOLS_PER_SLOT,
+              "First symbol %d and number of symbol %d not compatible with number of symbols in a slot %d\n",
+              first_symbol, nsymb, NR_NUMBER_OF_SYMBOLS_PER_SLOT);
   int symb_offset = (slot % frame_parms->slots_per_subframe) * frame_parms->symbols_per_slot;
 
   for (int symbol = first_symbol; symbol < first_symbol + nsymb; symbol++) {
diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index 41e80cc7d4..53c691afa3 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -1268,8 +1268,7 @@ int main(int argc, char **argv)
                                gNB->frame_parms.N_RB_UL,
                                offset,
                                0,
-                               gNB->frame_parms.Ncp == EXTENDED ? 12 : 14,
-                               link_type_ul);
+                               gNB->frame_parms.Ncp == EXTENDED ? 12 : 14);
         }
 
         ul_proc_error = phy_procedures_gNB_uespec_RX(gNB, frame, slot);