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"