diff --git a/sbin/ipfw/dummynet.c b/sbin/ipfw/dummynet.c
index 4efc35ca950c..5c83db99b973 100644
--- a/sbin/ipfw/dummynet.c
+++ b/sbin/ipfw/dummynet.c
@@ -38,7 +38,6 @@
 #include <string.h>
 #include <sysexits.h>
 
-#include <net/if.h>
 #include <net/if.h>
 #include <netinet/in.h>
 #include <netinet/ip_fw.h>