diff --git a/libc/include/sys/reg.h b/libc/include/sys/reg.h
index 6c496ba..1066b6d 100644
--- a/libc/include/sys/reg.h
+++ b/libc/include/sys/reg.h
@@ -83,4 +83,4 @@
 
 #endif
 
-#endif
+#endif /* _SYS_REG_H_ */