diff --git a/test/recipes/tconversion.pl b/test/recipes/tconversion.pl
index 4eef7c17a322ec65e1383b45c15bb082a5d3d54a..011dcbffb9ff6c9b9ffb43b8e915c4f26dd29308 100644
--- a/test/recipes/tconversion.pl
+++ b/test/recipes/tconversion.pl
@@ -9,8 +9,9 @@ use lib 'testlib';
 use OpenSSL::Test qw/:DEFAULT top_file/;
 
 my %conversionforms = (
+    # Default conversion forms.  Other series may be added with
+    # specific test types as key.
     "*"		=> [ "d", "p" ],
-    x509	=> [ "d", "n", "p" ],
     );
 sub tconversion {
     my $testtype = shift;