diff --git a/bsp/stm32f40x/Libraries/SConscript b/bsp/stm32f40x/Libraries/SConscript
index d23856456a2a77d6cd017b77a0ae54f6aae76924..c83c06b4399cb41932c72763fac7fd7e2d4f2880 100644
--- a/bsp/stm32f40x/Libraries/SConscript
+++ b/bsp/stm32f40x/Libraries/SConscript
@@ -18,8 +18,8 @@ if rtconfig.CROSS_TOOL == 'gcc':
      src = src + ['CMSIS/ST/STM32F4xx/Source/Templates/gcc_ride7/startup_stm32f4xx.s']
 elif rtconfig.CROSS_TOOL == 'keil':
      src = src + ['CMSIS/ST/STM32F4xx/Source/Templates/arm/startup_stm32f4xx.s']
-# elif rtconfig.CROSS_TOOL == 'iar':
-    # src = src + ['CMSIS/CM3/DeviceSupport/ST/STM32F10x/startup/iar/' + startup_scripts[rtconfig.STM32_TYPE]]
+elif rtconfig.CROSS_TOOL == 'iar':
+    src = src + ['CMSIS/ST/STM32F4xx/Source/Templates/iar/startup_stm32f4xx.s']
 
 path = [cwd + '/STM32F4xx_StdPeriph_Driver/inc', 
     cwd + '/CMSIS/ST/STM32F4xx/Include',