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diff --git a/share/man/man4/ipfirewall.4 b/share/man/man4/ipfirewall.4
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--- a/share/man/man4/ipfirewall.4
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@@ -8,10 +8,10 @@
.Nm ipfirewall
.Nd IP packet filter and traffic accounting
.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/queue.h>
-.Fd #include <netinet/in.h>
-.Fd #include <netinet/ip_fw.h>
+.In sys/types.h
+.In sys/queue.h
+.In netinet/in.h
+.In netinet/ip_fw.h
.Ft int
.Fn setsockopt raw_socket IPPROTO_IP "ipfw option" "struct ipfw" size
.Sh DESCRIPTION
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