diff --git a/BaS_gcc/include/bas_string.h b/BaS_gcc/include/bas_string.h
index c743c95..d2430fd 100644
--- a/BaS_gcc/include/bas_string.h
+++ b/BaS_gcc/include/bas_string.h
@@ -34,6 +34,7 @@ extern char *strcat(char *dst, const char *src);
 extern char *strncat(char *dst, const char *src, size_t max);
 extern int atoi(const char *c);
 extern void *memcpy(void *dst, const void *src, size_t n);
+extern void *memmove(void *dst, const void *src, size_t n);
 extern void *memset(void *s, int c, size_t n);
 extern int memcmp(const void *s1, const void *s2, size_t max);
 extern void bzero(void *s, size_t n);