diff --git a/src/debug.c b/src/debug.c
index 96c58ed8d..203dcf981 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -1,4 +1,3 @@
-#include <stdint.h>
 #include <string.h>
 #include <mruby.h>
 #include <mruby/irep.h>