diff --git a/inc/wofi.h b/inc/wofi.h
index 9e0aa0b..ce6c043 100644
--- a/inc/wofi.h
+++ b/inc/wofi.h
@@ -29,6 +29,7 @@
 #include <stddef.h>
 #include <string.h>
 #include <libgen.h>
+#include <unistd.h>
 
 #include <sys/stat.h>