diff --git a/FreeRTOS/Demo/Posix_GCC/main.c b/FreeRTOS/Demo/Posix_GCC/main.c
index f5773de512..7f0fcf9fbc 100644
--- a/FreeRTOS/Demo/Posix_GCC/main.c
+++ b/FreeRTOS/Demo/Posix_GCC/main.c
@@ -268,7 +268,7 @@ void vApplicationTickHook( void )
 
 /*-----------------------------------------------------------*/
 
-void traceOnEnter()
+void traceOnEnter( void )
 {
     #if ( TRACE_ON_ENTER == 1 )
         int xReturn;