--- TWiki.pm.dist	2005-04-09 18:37:05.273466000 +0200
+++ TWiki.pm	2005-04-09 18:38:49.793470000 +0200
@@ -526,6 +526,7 @@
 	$siteLocale =~ m/\.([a-z0-9_-]+)$/i;
 	$siteCharset = $1 if defined $1;
 	$siteCharset =~ s/^utf8$/utf-8/i;	# For convenience, avoid overrides
+	$siteCharset =~ s/^iso8859-/iso-8859-/i;
 	$siteCharset =~ s/^eucjp$/euc-jp/i;
 
 	# Override charset - used when locale charset not supported by Perl