diff --git a/portable/IAR/ARM_CM0/port.c b/portable/IAR/ARM_CM0/port.c
index d99af0fe2..f38d0e1a8 100644
--- a/portable/IAR/ARM_CM0/port.c
+++ b/portable/IAR/ARM_CM0/port.c
@@ -96,7 +96,6 @@ static UBaseType_t uxCriticalNesting = 0xaaaaaaaa;
  * file is weak to allow application writers to change the timer used to
  * generate the tick interrupt.
  */
-#pragma weak vPortSetupTimerInterrupt
 void vPortSetupTimerInterrupt( void );
 
 /*
@@ -242,7 +241,7 @@ void xPortSysTickHandler( void )
  * Setup the systick timer to generate the tick interrupts at the required
  * frequency.
  */
-void vPortSetupTimerInterrupt( void )
+__weak void vPortSetupTimerInterrupt( void )
 {
     /* Calculate the constants required to configure the tick interrupt. */
     #if ( configUSE_TICKLESS_IDLE == 1 )