diff --git a/portable/ThirdParty/GCC/Posix/port.c b/portable/ThirdParty/GCC/Posix/port.c
index e80f7518f..5cb70a514 100644
--- a/portable/ThirdParty/GCC/Posix/port.c
+++ b/portable/ThirdParty/GCC/Posix/port.c
@@ -111,6 +111,7 @@ static void prvSuspendSelf( Thread_t * thread);
 static void prvResumeThread( Thread_t * xThreadId );
 static void vPortSystemTickHandler( int sig );
 static void vPortStartFirstTask( void );
+static void prvPortYieldFromISR( void );
 /*-----------------------------------------------------------*/
 
 static void prvFatalError( const char *pcCall, int iErrno )
@@ -267,7 +268,7 @@ void vPortExitCritical( void )
 }
 /*-----------------------------------------------------------*/
 
-void vPortYieldFromISR( void )
+static void prvPortYieldFromISR( void )
 {
 Thread_t *xThreadToSuspend;
 Thread_t *xThreadToResume;
@@ -286,7 +287,7 @@ void vPortYield( void )
 {
     vPortEnterCritical();
 
-    vPortYieldFromISR();
+    prvPortYieldFromISR();
 
     vPortExitCritical();
 }
diff --git a/portable/ThirdParty/GCC/Posix/utils/wait_for_event.c b/portable/ThirdParty/GCC/Posix/utils/wait_for_event.c
index 894c6314f..144eba6c8 100644
--- a/portable/ThirdParty/GCC/Posix/utils/wait_for_event.c
+++ b/portable/ThirdParty/GCC/Posix/utils/wait_for_event.c
@@ -39,7 +39,7 @@ struct event
     bool event_triggered;
 };
 
-struct event * event_create()
+struct event * event_create( void )
 {
     struct event * ev = malloc( sizeof( struct event ) );
 
diff --git a/portable/ThirdParty/GCC/Posix/utils/wait_for_event.h b/portable/ThirdParty/GCC/Posix/utils/wait_for_event.h
index 36603392f..65e3e5481 100644
--- a/portable/ThirdParty/GCC/Posix/utils/wait_for_event.h
+++ b/portable/ThirdParty/GCC/Posix/utils/wait_for_event.h
@@ -34,7 +34,7 @@
 
 struct event;
 
-struct event * event_create();
+struct event * event_create( void );
 void event_delete( struct event * );
 bool event_wait( struct event * ev );
 bool event_wait_timed( struct event * ev,