diff --git a/src/xcb_in.c b/src/xcb_in.c
index db9d1ca..ecacb99 100644
--- a/src/xcb_in.c
+++ b/src/xcb_in.c
@@ -30,6 +30,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <sys/select.h>
 #include <errno.h>
 
 #include "xcb.h"