diff --git a/document.c b/document.c
index 686be5f..beed99b 100644
--- a/document.c
+++ b/document.c
@@ -4,6 +4,7 @@
 #define _XOPEN_SOURCE 700
 // TODO: Implement realpath
 
+#include <sys/wait.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>