diff --git a/prog_limit.c b/prog_limit.c
--- a/prog_limit.c
+++ b/prog_limit.c
@@ -5,7 +5,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <wait.h>
+#include <sys/wait.h>
 #include <unistd.h>
 
 int set_limit (int);