diff --git a/targets/TARGET_NUVOTON/nu_bitutil.h b/targets/TARGET_NUVOTON/nu_bitutil.h
index 42708232a8..ff4745aabe 100644
--- a/targets/TARGET_NUVOTON/nu_bitutil.h
+++ b/targets/TARGET_NUVOTON/nu_bitutil.h
@@ -17,7 +17,7 @@
 #ifndef NU_BIT_UTIL_H
 #define NU_BIT_UTIL_H
 
-#if defined(TOOLCHAIN_IAR) && defined(TARGET_M0)
+#if defined(__ICCARM__) && defined(TARGET_M0)
 #include <arm_math.h>
 #endif
 #include "cmsis.h"