diff --git a/lib/saml20.js b/lib/saml20.js
index 21c1f278..e79b6e94 100644
--- a/lib/saml20.js
+++ b/lib/saml20.js
@@ -81,7 +81,7 @@ exports.create = function(options, callback) {
 
   sig.signingKey = options.key;
   
-  sig.keyInfoProvider = {
+  sig.keyInfoProvider = options.keyInfoProvider || {
     getKeyInfo: function (key, prefix) {
       prefix = prefix ? prefix + ':' : prefix;
       return "<" + prefix + "X509Data><" + prefix + "X509Certificate>" + cert + "</" + prefix + "X509Certificate></" + prefix + "X509Data>";