diff --git a/Source/portable/IAR/MSP430X/port.c b/Source/portable/IAR/MSP430X/port.c
index ac8901243..efff17761 100644
--- a/Source/portable/IAR/MSP430X/port.c
+++ b/Source/portable/IAR/MSP430X/port.c
@@ -197,7 +197,7 @@ void vPortSetupTimerInterrupt( void )
 /*-----------------------------------------------------------*/
 
 #pragma vector=configTICK_VECTOR
-__interrupt void vTickISREntry( void )
+__interrupt __raw void vTickISREntry( void )
 {
 extern void vPortTickISR( void );