diff --git a/ThinkPink/mainwindow.h b/ThinkPink/mainwindow.h
index e834f8c..a89a1ae 100644
--- a/ThinkPink/mainwindow.h
+++ b/ThinkPink/mainwindow.h
@@ -2,6 +2,7 @@
 #define MAINWINDOW_H
 #include <stdlib.h>
 #include <time.h>
+#include <unistd.h>
 #include <vector>
 
 #include <QDebug>