diff --git a/cf/roken-frag.m4 b/cf/roken-frag.m4
index c93318537..ecdb70624 100644
--- a/cf/roken-frag.m4
+++ b/cf/roken-frag.m4
@@ -486,6 +486,7 @@ AC_NEED_PROTO([#include <stdlib.h>], unsetenv)
 AC_NEED_PROTO([#include <unistd.h>], gethostname)
 AC_NEED_PROTO([#include <unistd.h>], mkstemp)
 AC_NEED_PROTO([#include <unistd.h>], getusershell)
+AC_NEED_PROTO([#include <unistd.h>], daemon)
 
 AC_NEED_PROTO([
 #ifdef HAVE_SYS_TYPES_H