diff --git a/arch/sim/src/sim/up_usrsock.c b/arch/sim/src/sim/up_usrsock.c
index d493e8fc9f1..0d4121bc6eb 100644
--- a/arch/sim/src/sim/up_usrsock.c
+++ b/arch/sim/src/sim/up_usrsock.c
@@ -399,6 +399,7 @@ static const usrsock_handler_t g_usrsock_handler[] =
  * Public Functions
  ****************************************************************************/
 
+__attribute__ ((visibility("default")))
 int usrsock_event_callback(int16_t usockid, uint16_t events)
 {
   return usrsock_send_event(&g_usrsock, usockid, events);