diff --git a/executables/main-ocp.c b/executables/main-ocp.c
index afcc1a2363..e1c3c94d4d 100644
--- a/executables/main-ocp.c
+++ b/executables/main-ocp.c
@@ -747,6 +747,7 @@ void tx_rf(RU_t *ru) {
 
 static void *ru_thread( void *param ) {
    setbuf(stdout, NULL);
+   setbuf(stderr, NULL);
   RU_t               *ru      = (RU_t *)param;
 
   if (ru->if_south == LOCAL_RF) { // configure RF parameters only