diff --git a/lang/js/BrowserTestExtension/browsertest.html b/lang/js/BrowserTestExtension/browsertest.html
index a20cfe19..0d3e2936 100644
--- a/lang/js/BrowserTestExtension/browsertest.html
+++ b/lang/js/BrowserTestExtension/browsertest.html
@@ -15,6 +15,7 @@
     <script src="tests/inputvalues.js"></script>
 <!-- insert tests here-->
     <script src="tests/startup.js"></script>
+    <script src="tests/KeyInfos.js"></script>
     <script src="tests/encryptTest.js"></script>
     <script src="tests/encryptDecryptTest.js"></script>
     <script src="tests/signTest.js"></script>
diff --git a/lang/js/BrowserTestExtension/tests/KeyInfos.js b/lang/js/BrowserTestExtension/tests/KeyInfos.js
new file mode 100644
index 00000000..03773a44
--- /dev/null
+++ b/lang/js/BrowserTestExtension/tests/KeyInfos.js
@@ -0,0 +1,46 @@
+/* gpgme.js - Javascript integration for gpgme
+ * Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1+
+ *
+ * Author(s):
+ *     Maximilian Krambach <mkrambach@intevation.de>
+ */
+
+/* global describe, it, expect, before, Gpgmejs */
+/* global inputvalues, fixedLengthString */
+
+describe('Key information', function () {
+    let context = null;
+    before(function(done){
+        const prm = Gpgmejs.init();
+        prm.then(function(gpgmejs){
+            context = gpgmejs;
+            done();
+        });
+    });
+
+    it('A fingerprint is consistently returned upper case hex', function(done){
+        const mixedCase = inputvalues.encrypt.good.fingerprint_mixedcase;
+        context.Keyring.getKeys(mixedCase).then(function(result){
+            expect(result).to.be.an('array');
+            expect(result.length).to.equal(1);
+            expect(result[0].fingerprint).to.equal(mixedCase.toUpperCase());
+            done();
+        });
+    });
+});
\ No newline at end of file
diff --git a/lang/js/BrowserTestExtension/tests/inputvalues.js b/lang/js/BrowserTestExtension/tests/inputvalues.js
index 1e8f1544..7dda47cd 100644
--- a/lang/js/BrowserTestExtension/tests/inputvalues.js
+++ b/lang/js/BrowserTestExtension/tests/inputvalues.js
@@ -28,6 +28,7 @@ const inputvalues = {// eslint-disable-line no-unused-vars
             // Fingerprint of a key that has been imported to gnupg
             // (i.e. see testkey.pub; testkey.sec)
             fingerprint : 'D41735B91236FDB882048C5A2301635EEFF0CB05',
+            fingerprint_mixedcase: 'D41735B91236fdb882048C5A2301635eeFF0Cb05',
             data_nonascii: '¡Äußerste µ€ før ñoquis@hóme! Добрый день',
 
             // used for checking encoding consistency in > 2MB messages.
diff --git a/lang/js/src/Key.js b/lang/js/src/Key.js
index 88c49d3f..eeb27035 100644
--- a/lang/js/src/Key.js
+++ b/lang/js/src/Key.js
@@ -58,7 +58,7 @@ export class GPGME_Key {
          */
         this.isAsync = async;
 
-        let _data = {fingerprint: fingerprint};
+        let _data = {fingerprint: fingerprint.toUpperCase()};
         this.getFingerprint = function(){
             if (!_data.fingerprint || !isFingerprint(_data.fingerprint)){
                 return gpgme_error('KEY_INVALID');
@@ -88,7 +88,8 @@ export class GPGME_Key {
             if (typeof(data) !== 'object') {
                 return gpgme_error('KEY_INVALID');
             }
-            if (!data.fingerprint || data.fingerprint !== _data.fingerprint){
+            if (!data.fingerprint ||
+                data.fingerprint.toUpperCase() !== _data.fingerprint){
                 return gpgme_error('KEY_INVALID');
             }
             let keys = Object.keys(data);