diff --git a/hal/targets/cmsis/TARGET_RENESAS/TARGET_VK_RZ_A1H/TOOLCHAIN_IAR/startup_VKRZA1H.s b/hal/targets/cmsis/TARGET_RENESAS/TARGET_VK_RZ_A1H/TOOLCHAIN_IAR/startup_VKRZA1H.s
index 451f8e032f..e907007d20 100644
--- a/hal/targets/cmsis/TARGET_RENESAS/TARGET_VK_RZ_A1H/TOOLCHAIN_IAR/startup_VKRZA1H.s
+++ b/hal/targets/cmsis/TARGET_RENESAS/TARGET_VK_RZ_A1H/TOOLCHAIN_IAR/startup_VKRZA1H.s
@@ -30,7 +30,7 @@
         SECTION .intvec:CODE:NOROOT(2)
 
         PUBLIC  __vector
-        PUBLIC  __iar_program_start
+        PUBWEAK __iar_program_start
         PUBLIC  Undefined_Handler
         EXTERN  SWI_Handler
         PUBLIC  Prefetch_Handler