diff --git a/cooldown/src/main.cpp b/cooldown/src/main.cpp
index bead4c1..b9a64dd 100644
--- a/cooldown/src/main.cpp
+++ b/cooldown/src/main.cpp
@@ -1,3 +1,4 @@
+#include <unistd.h>
 #include	<iostream>
 #include	"main.h"
 #include	"Cooldown.h"