diff --git a/net/bmon/files/patch-configure.ac b/net/bmon/files/patch-configure.ac
new file mode 100644
index 000000000000..c032305e7a7f
--- /dev/null
+++ b/net/bmon/files/patch-configure.ac
@@ -0,0 +1,11 @@
+--- configure.ac.orig	2014-07-06 11:51:29 UTC
++++ configure.ac
+@@ -164,7 +164,7 @@ case ${target_os} in
+ 	AC_DEFINE_UNQUOTED(SYS_SUNOS, "1", [operating system])
+     ;;
+ 
+-    *bsd*)
++    *bsd*|dragonfly*)
+ 	AC_DEFINE_UNQUOTED(SYS_BSD, "1", [operating system])
+     ;;
+