diff --git a/save_server.cgi b/save_server.cgi
index aedd2cc..e3a3276 100644
--- a/save_server.cgi
+++ b/save_server.cgi
@@ -81,17 +81,6 @@ else {
 	&nginx_text_parse("server_name", $server, undef, '^\S+$', undef, 1);
 	$name = $in{'server_name'};
 
-	# Get param for default server
-	my $ver = &get_nginx_version();
-	my $defserv;
-	if ($ver > 0.8 ||
-	    $ver =~ /^0\.8\.(\d+)/ && $1 >= 21) {
-		$defserv = "default_server";
-		}
-	else {
-		$defserv = "default";
-		}
-
 	# Addresses to accept connections on
 	# XXX preserve existing args
 	my $i = 0;
@@ -129,7 +118,7 @@ else {
 		# Other random options
 		my @words = ( $ip );
 		if ($in{"default_$i"}) {
-			push(@words, $defserv);
+			push(@words, &get_default_server_param());
 			}
 		if ($in{"ssl_$i"}) {
 			push(@words, "ssl");
diff --git a/virtualmin-nginx-lib.pl b/virtualmin-nginx-lib.pl
index f27f40a..be5aff9 100644
--- a/virtualmin-nginx-lib.pl
+++ b/virtualmin-nginx-lib.pl
@@ -533,6 +533,13 @@ sub get_default
 return $dir ? $dir->{'default'} : undef;
 }
 
+sub get_default_server_param
+{
+my $ver = &get_nginx_version();
+return &compare_version_numbers($ver, "0.8.21") >= 0 ?
+	"default_server" : "default";
+}
+
 # list_nginx_modules()
 # Returns a list of enabled modules. Includes those compiled in by default
 # unless disabled, plus extra compiled in at build time.