diff --git a/sbin/ipfw/ipfw2.c b/sbin/ipfw/ipfw2.c
index ac0865f7f87d..08c703bd7b55 100644
--- a/sbin/ipfw/ipfw2.c
+++ b/sbin/ipfw/ipfw2.c
@@ -40,6 +40,7 @@
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
+#include <timeconv.h>
 #include <unistd.h>
 #include <sysexits.h>