diff --git a/other/websockify.c b/other/websockify.c
index 4032171..a093e1c 100644
--- a/other/websockify.c
+++ b/other/websockify.c
@@ -16,6 +16,7 @@
 #include <netdb.h>
 #include <sys/select.h>
 #include <fcntl.h>
+#include <unistd.h>
 #include <sys/stat.h>
 #include "websocket.h"