diff --git a/targets/RT/USER/lte-ru.c b/targets/RT/USER/lte-ru.c
index 26d8e9b110..3aaa64be26 100644
--- a/targets/RT/USER/lte-ru.c
+++ b/targets/RT/USER/lte-ru.c
@@ -1871,7 +1871,8 @@ void *ru_thread_synch(void *arg) {
       else {
         write_output("ru_sync.m","sync",(void*)&sync_corr[0],fp->samples_per_tti*5,1,2);
         write_output("ru_rx.m","rxs",(void*)ru->common.rxdata[0],fp->samples_per_tti*10,1,1);
-      }
+        exit(1); 
+     }
     } // ru->in_synch==0
 
     if (release_thread(&ru->proc.mutex_synch,&ru->proc.instance_cnt_synch,"ru_synch_thread") < 0) break;