diff --git a/src/rpc/genprotocol.pl b/src/rpc/genprotocol.pl
index c8c15700b3..f02ce13494 100755
--- a/src/rpc/genprotocol.pl
+++ b/src/rpc/genprotocol.pl
@@ -31,7 +31,7 @@ open RPCGEN, "-|", $rpcgen, $mode, $xdrdef
 open TARGET, ">$target"
     or die "cannot create $target: $!";
 
-my $fixup = $^O eq "linux" || $^O eq "cygwin";
+my $fixup = $^O eq "linux" || $^O eq "cygwin" || $^O eq "gnukfreebsd";
 
 if ($mode eq "-c") {
     print TARGET "#include <config.h>\n";