diff --git a/targets/RT/USER/lte-ru.c b/targets/RT/USER/lte-ru.c
index f7ce527529..df056f209d 100644
--- a/targets/RT/USER/lte-ru.c
+++ b/targets/RT/USER/lte-ru.c
@@ -1654,7 +1654,7 @@ static void* ru_thread( void* param ) {
   
 
           // wait to be woken up
-          if (wait_on_condition(&ru->proc.mutex_ru_thread,&ru->proc.cond_ru_thread,&ru->proc.instance_cnt_ru,"ru_thread")<0) break;
+          if (wait_on_condition(&ru->proc.mutex_ru,&ru->proc.cond_ru_thread,&ru->proc.instance_cnt_ru,"ru_thread")<0) break;
 	  
 
 	  // Start RF device if any