diff --git a/openair1/SIMULATION/NR_PHY/dlschsim.c b/openair1/SIMULATION/NR_PHY/dlschsim.c
index fedf9394da..dba2cdafd7 100644
--- a/openair1/SIMULATION/NR_PHY/dlschsim.c
+++ b/openair1/SIMULATION/NR_PHY/dlschsim.c
@@ -66,6 +66,8 @@ PHY_VARS_NR_UE *PHY_vars_UE_g[1][1] = { { NULL } };
 uint16_t n_rnti = 0x1234;
 openair0_config_t openair0_cfg[MAX_CARDS];
 
+void init_downlink_harq_status(NR_DL_UE_HARQ_t *dl_harq) {}
+
 int main(int argc, char **argv)
 {
 	char c;
diff --git a/openair1/SIMULATION/NR_PHY/pucchsim.c b/openair1/SIMULATION/NR_PHY/pucchsim.c
index a754df4763..5c88c37e53 100644
--- a/openair1/SIMULATION/NR_PHY/pucchsim.c
+++ b/openair1/SIMULATION/NR_PHY/pucchsim.c
@@ -59,6 +59,8 @@ uint16_t NB_UE_INST = 1;
 // needed for some functions
 PHY_VARS_NR_UE * PHY_vars_UE_g[1][1]={{NULL}};
 
+void init_downlink_harq_status(NR_DL_UE_HARQ_t *dl_harq) {}
+
 int main(int argc, char **argv)
 {
   char c;
diff --git a/openair1/SIMULATION/NR_PHY/ulschsim.c b/openair1/SIMULATION/NR_PHY/ulschsim.c
index de28e67653..2adad730fa 100644
--- a/openair1/SIMULATION/NR_PHY/ulschsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulschsim.c
@@ -54,6 +54,8 @@ PHY_VARS_NR_UE *UE;
 RAN_CONTEXT_t RC;
 int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
 
+void init_downlink_harq_status(NR_DL_UE_HARQ_t *dl_harq) {}
+
 double cpuf;
 uint8_t nfapi_mode = 0;
 uint16_t NB_UE_INST = 1;