diff --git a/base/tuple.h b/base/tuple.h
index d17d9f5..bcd2ad4 100644
--- a/base/tuple.h
+++ b/base/tuple.h
@@ -28,6 +28,7 @@
 
 #ifndef BASE_TUPLE_H__
 #define BASE_TUPLE_H__
+#pragma once
 
 // Traits ----------------------------------------------------------------------
 //