diff --git a/src/pool.c b/src/pool.c
index b87d2cfaa..ab30be1d8 100644
--- a/src/pool.c
+++ b/src/pool.c
@@ -4,8 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <stddef.h>
-#include <stdint.h>
 #include <string.h>
 #include <mruby.h>