diff --git a/bsp/gd32/gd32407v-start/board/SConscript b/bsp/gd32/gd32407v-start/board/SConscript
index 7580a9c5e8391ca7179797409d1cc8d13c49b610..95b376bd923aeef744cda16d031eaf727275e6e5 100644
--- a/bsp/gd32/gd32407v-start/board/SConscript
+++ b/bsp/gd32/gd32407v-start/board/SConscript
@@ -19,7 +19,9 @@ if rtconfig.CROSS_TOOL == 'gcc':
     src += [startup_path_prefix + '/GD32F4xx_HAL/CMSIS/GD/GD32F4xx/Source/GCC/startup_gd32f4xx.S']
 elif rtconfig.CROSS_TOOL == 'keil':
     src += [startup_path_prefix + '/GD32F4xx_HAL/CMSIS/GD/GD32F4xx/Source/ARM/startup_gd32f4xx.s']
-
+elif rtconfig.CROSS_TOOL == 'iar':
+    src += [startup_path_prefix + '/GD32F4xx_HAL/CMSIS/GD/GD32F4xx/Source/IAR/startup_gd32f4xx.s']
+    
 CPPDEFINES = ['GD32F407xx']
 group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path, CPPDEFINES = CPPDEFINES)