diff --git a/user/libs/libc/string.h b/user/libs/libc/string.h
index ade86b6c..3ad020f9 100644
--- a/user/libs/libc/string.h
+++ b/user/libs/libc/string.h
@@ -46,4 +46,6 @@ char* strcpy(char* dst, const char* src);
  * @param src 源串
  * @return char*
  */
-char *strcat(char *dest, const char *src);
\ No newline at end of file
+char *strcat(char *dest, const char *src);
+
+#define memcpy(dst, src, n) __builtin_memcpy(dst, src, n)
\ No newline at end of file