diff --git a/cpu/avr8_common/avr_libc_extra/include/unistd.h b/cpu/avr8_common/avr_libc_extra/include/unistd.h
index 39049c605f..dfe62e4ec0 100644
--- a/cpu/avr8_common/avr_libc_extra/include/unistd.h
+++ b/cpu/avr8_common/avr_libc_extra/include/unistd.h
@@ -80,8 +80,8 @@ int          pipe(int [2]);
 ssize_t      pread(int, void *, size_t, off_t);
 ssize_t      pwrite(int, const void *, size_t, off_t);
 ssize_t      read(int, void *, size_t);
-ssize_t      readlink(const char *restrict, char *restrict, size_t);
-ssize_t      readlinkat(int, const char *restrict, char *restrict, size_t);
+ssize_t      readlink(const char *__restrict, char *__restrict, size_t);
+ssize_t      readlinkat(int, const char *__restrict, char *__restrict, size_t);
 int          rmdir(const char *);
 int          setegid(gid_t);
 int          seteuid(uid_t);