diff --git a/lib/dn.js b/lib/dn.js
index c987ae4..c029d95 100644
--- a/lib/dn.js
+++ b/lib/dn.js
@@ -26,7 +26,7 @@ function RDN(obj) {
 
   if (obj) {
     Object.keys(obj).forEach(function(k) {
-      self[k] = obj[k];
+      self[k.toLowerCase()] = obj[k];
     });
   }
 }
@@ -66,7 +66,7 @@ function parse(name) {
       trim();
       var value = parseAttrValue();
       trim();
-      rdn[attr] = value;
+      rdn[attr.toLowerCase()] = value;
       if (cur >= len || name[cur] !== '+')
         break;
       ++cur;
diff --git a/tst/dn.test.js b/tst/dn.test.js
index ccdf06e..4eb106d 100644
--- a/tst/dn.test.js
+++ b/tst/dn.test.js
@@ -123,3 +123,11 @@ test('empty DNs GH-16', function(t) {
   t.notOk(_dn2.childOf(''));
   t.end();
 });
+
+
+test('case insensitive attribute names GH-20', function(t) {
+  var dn1 = dn.parse('CN=foo, dc=bar');
+  t.ok(dn1.equals('cn=foo, dc=bar'));
+  t.ok(dn1.equals(dn.parse('cn=foo, DC=bar')));
+  t.end();
+});