diff --git a/portable/GCC/ATMega323/port.c b/portable/GCC/ATMega323/port.c
index 3aa55c383..47f645532 100644
--- a/portable/GCC/ATMega323/port.c
+++ b/portable/GCC/ATMega323/port.c
@@ -402,8 +402,8 @@ uint8_t ucHighByte, ucLowByte;
 	 * the context is saved at the start of vPortYieldFromTick().  The tick
 	 * count is incremented after the context is saved.
 	 */
-	void SIG_OUTPUT_COMPARE1A( void ) __attribute__ ( ( signal, naked ) );
-	void SIG_OUTPUT_COMPARE1A( void )
+	void TIMER1_COMPA_vect( void ) __attribute__ ( ( signal, naked ) );
+	void TIMER1_COMPA_vect( void )
 	{
 		vPortYieldFromTick();
 		asm volatile ( "reti" );
@@ -415,8 +415,8 @@ uint8_t ucHighByte, ucLowByte;
 	 * tick count.  We don't need to switch context, this can only be done by
 	 * manual calls to taskYIELD();
 	 */
-	void SIG_OUTPUT_COMPARE1A( void ) __attribute__ ( ( signal ) );
-	void SIG_OUTPUT_COMPARE1A( void )
+	void TIMER1_COMPA_vect( void ) __attribute__ ( ( signal ) );
+	void TIMER1_COMPA_vect( void )
 	{
 		xTaskIncrementTick();
 	}