diff --git a/lib/get-certificate.js b/lib/get-certificate.js
index 813ae7e..47dd039 100644
--- a/lib/get-certificate.js
+++ b/lib/get-certificate.js
@@ -102,11 +102,9 @@ function getCert(options, cb) {
 
     thumbprint=cryptoUtil.thumbprint(state.accountKeyPair.publicKey);
     keyAuthorization=challenge.token+'.'+thumbprint;
-    challengePath='.well-known/acme-challenge/'+challenge.token;
     state.responseUrl=challenge.uri;
-    state.path=challengePath;
 
-    options.setChallenge(state.domain, '/'+challengePath, keyAuthorization, challengeDone);
+    options.setChallenge(state.domain, challenge.token, keyAuthorization, challengeDone);
 
     function challengeDone() {
       state.acme.post(state.responseUrl, {
@@ -114,7 +112,7 @@ function getCert(options, cb) {
         keyAuthorization:keyAuthorization
       }, function(err, res, body) {
         ensureValidation(err, res, body, function unlink() {
-          options.removeChallenge(state.domain, '/'+challengePath, function () {
+          options.removeChallenge(state.domain, challenge.token, function () {
             // ignore
           });
         });