diff --git a/openair1/PHY/MODULATION/slot_fep_nr.c b/openair1/PHY/MODULATION/slot_fep_nr.c
index e7a36ff2e1..930eee39fb 100644
--- a/openair1/PHY/MODULATION/slot_fep_nr.c
+++ b/openair1/PHY/MODULATION/slot_fep_nr.c
@@ -117,7 +117,7 @@ int nr_slot_fep(PHY_VARS_NR_UE *ue,
     return(-1);
     }*/
 
-  if (Ns<0 || Ns>=(frame_parms->slots_per_frame-1)) {
+  if (Ns<0 || Ns>(frame_parms->slots_per_frame-1)) {
     printf("slot_fep: Ns must be between 0 and %d\n",frame_parms->slots_per_frame-1);
     return(-1);
   }