diff --git a/main.cpp b/main.cpp
index 9f99d3f..dc7df16 100644
--- a/main.cpp
+++ b/main.cpp
@@ -2,6 +2,7 @@
 #include <cmath>
 #include <fcntl.h>
 #include <ncurses.h>
+#include <unistd.h>
 #include "gtuna.hpp"
 
 using std::cout;