diff --git a/shake/judge.h b/shake/judge.h

index 959615a..2bf94a3 100644

--- a/shake/judge.h

+++ b/shake/judge.h

@@ -19,6 +19,7 @@

 #ifndef JUDGE_H

 # define JUDGE_H

+#include <sys/types.h>

 #include <stdbool.h>

 #include <fcntl.h>

 #include <time.h>