diff --git a/libc/include/sys/ipc.h b/libc/include/sys/ipc.h
index dee7c8a..3d6c45f 100644
--- a/libc/include/sys/ipc.h
+++ b/libc/include/sys/ipc.h
@@ -42,8 +42,8 @@
 
 __BEGIN_DECLS
 
-key_t ftok(const char* __path, int __id);
+key_t ftok(const char* path, int id);
 
 __END_DECLS
 
-#endif
+#endif /* _SYS_IPC_H */