diff --git a/babeld/src/ubus.h b/babeld/src/ubus.h
index 9c16e37..1dd5e6e 100644
--- a/babeld/src/ubus.h
+++ b/babeld/src/ubus.h
@@ -22,9 +22,9 @@
 */
 
 #include <stdbool.h>
+#include <sys/select.h>
 
 struct babel_route;
-struct fd_set;
 struct neighbour;
 struct xroute;