diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index deac92b..dca9b3d 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -183,7 +183,8 @@
 extern unsigned int sleep(unsigned int);
 extern int usleep(useconds_t);
 
-extern int gethostname(char *, size_t);
+int gethostname(char*, size_t);
+int sethostname(const char*, size_t);
 
 extern void *__brk(void *);
 extern int brk(void *);