diff --git a/include/tanabata.h b/include/tanabata.h
index 157a23d..8e9b959 100644
--- a/include/tanabata.h
+++ b/include/tanabata.h
@@ -7,11 +7,9 @@
 
 #ifdef __cplusplus
 #include <cstdint>
-#include <cstdio>
 extern "C" {
 #else
 #include <stdint.h>
-#include <stdio.h>
 #endif
 
 #include "core.h"