diff --git a/ioctl_main.c b/ioctl_main.c
index 802f145..3b5090e 100644
--- a/ioctl_main.c
+++ b/ioctl_main.c
@@ -17,6 +17,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
+#include <sys/select.h>
 #include "parse_opts.h"