diff --git a/finsh/finsh.h b/finsh/finsh.h
index a913588d48..1eb0310239 100644
--- a/finsh/finsh.h
+++ b/finsh/finsh.h
@@ -50,16 +50,21 @@
 typedef unsigned char  u_char;
 typedef unsigned short u_short;
 typedef unsigned long  u_long;
-typedef unsigned int size_t;
+
+#if !defined(__CC_ARM) && !defined(__ICCARM__)
+typedef unsigned int size_t;
 
 #ifndef NULL
 #define NULL RT_NULL
-#endif
+#endif
 
 #define memset	rt_memset
 #define strlen	rt_strlen
 #define strncpy	rt_strncpy
 #define strncmp	rt_strncmp
+#else
+#include <string.h>
+#endif
 
 int strcmp (const char *s1, const char *s2);
 char *strdup(const char *s);
@@ -260,10 +265,10 @@ int finsh_init(struct finsh_parser* parser);
 int finsh_flush(struct finsh_parser* parser);
 /* reset all of finsh */
 int finsh_reset(struct finsh_parser* parser);
-#ifdef RT_USING_DEVICE
-/* set finsh device */
-void finsh_set_device(char* device_name);
-#endif
+#ifdef RT_USING_DEVICE
+/* set finsh device */
+void finsh_set_device(char* device_name);
+#endif
 
 /* run finsh parser to generate abstract synatx tree */
 void finsh_parser_run (struct finsh_parser* parser, const unsigned char* string);