diff --git a/fxlink/tui/tui-interactive.c b/fxlink/tui/tui-interactive.c
index cf31cf5..64ffd61 100644
--- a/fxlink/tui/tui-interactive.c
+++ b/fxlink/tui/tui-interactive.c
@@ -13,6 +13,7 @@
 #include <stdlib.h>
 #include <signal.h>
 #include <errno.h>
+#include <unistd.h>
 
 /*
 Plan for the TUI command set.