diff --git a/daemon/zero.c b/daemon/zero.c
index 00badd23a..14ae7ddfd 100644
--- a/daemon/zero.c
+++ b/daemon/zero.c
@@ -27,6 +27,7 @@
 
 #include "daemon.h"
 #include "actions.h"
+#include "optgroups.h"
 
 static const char zero_buf[4096];