diff --git a/targets/SIMU/USER/oaisim_functions.c b/targets/SIMU/USER/oaisim_functions.c
index 297156b727eca247060b2365b6131611924d375d..039b34f5a0f25cb5a8f4c4e64d08c8338ee6dd13 100644
--- a/targets/SIMU/USER/oaisim_functions.c
+++ b/targets/SIMU/USER/oaisim_functions.c
@@ -1016,8 +1016,8 @@ int eNB_trx_stop(openair0_device *device) {
 int UE_trx_start(openair0_device *device) {
   return(0);
 }
-int UE_trx_end(openair0_device *device) {
-  return(0);
+void UE_trx_end(openair0_device *device) {
+  return;
 }
 int UE_trx_stop(openair0_device *device) {
   return(0);