diff --git a/acme.js b/acme.js
index 1c35d4c..4c9a398 100644
--- a/acme.js
+++ b/acme.js
@@ -1055,9 +1055,7 @@ ACME._pollOrderStatus = function (me, options, kid, order, verifieds) {
 		}
 
 		if ('invalid' === resp.body.status) {
-			return Promise.reject(
-				E.ORDER_INVALID(options, verifieds, resp)
-			);
+			return Promise.reject(E.ORDER_INVALID(options, verifieds, resp));
 		}
 
 		if ('ready' === resp.body.status) {
@@ -1102,7 +1100,7 @@ ACME._redeemCert = function (me, options, kid, voucher) {
 		url: voucher._certificateUrl,
 		protected: { kid: kid },
 		payload: Enc.binToBuf(''),
-		json: true
+		headers: { Accept: 'application/pem-certificate-chain' }
 	}).then(function (resp) {
 		//#console.debug('ACME.js: csr submitted and cert received:');
 
diff --git a/utils.js b/utils.js
index 5c0d1bc..9cf0efa 100644
--- a/utils.js
+++ b/utils.js
@@ -28,7 +28,7 @@ U._jwsRequest = function (me, bigopts) {
 			.then(function (jws) {
 				//#console.debug('[ACME.js] url: ' + bigopts.url + ':');
 				//#console.debug(jws);
-				return U._request(me, { url: bigopts.url, json: jws });
+				return U._request(me, { url: bigopts.url, json: jws, headers: bigopts.headers });
 			})
 			.catch(function (e) {
 				if (/badNonce$/.test(e.urn)) {
@@ -84,7 +84,9 @@ U._request = function (me, opts) {
 		opts.headers['User-Agent'] = ua;
 	}
 	if (opts.json) {
-		opts.headers.Accept = 'application/json';
+		if (!opts.headers.Accept) {
+			opts.headers.Accept = 'application/json';
+		}
 		if (true !== opts.json) {
 			opts.body = JSON.stringify(opts.json);
 		}