diff --git a/Gruntfile.js b/Gruntfile.js
index 56e7405..2553a2f 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -278,7 +278,7 @@ module.exports = function(grunt) {
             suffix: ' (Alpha)',
             version: version,
             deleteKey: true,
-            keyServer: 'https://keys.whiteout.io'
+            keyServer: 'https://keys.whiteout.io/'
         });
     });
 
@@ -297,7 +297,7 @@ module.exports = function(grunt) {
             manifest.oauth2.client_id = options.client_id;
         }
         if (options.keyServer) {
-            var ksIndex = manifest.permissions.indexOf('https://keys-test.whiteout.io');
+            var ksIndex = manifest.permissions.indexOf('https://keys-test.whiteout.io/');
             manifest.permissions[ksIndex] = options.keyServer;
         }
         if (options.deleteKey) {
diff --git a/src/js/app-config.js b/src/js/app-config.js
index 616ae38..7cf5889 100644
--- a/src/js/app-config.js
+++ b/src/js/app-config.js
@@ -8,9 +8,13 @@ define(function(require) {
     // parse manifest to get configurations for current runtime
     try {
         var manifest = chrome.runtime.getManifest();
+        // get key server base url
         cloudUrl = _.find(manifest.permissions, function(permission) {
             return typeof permission === 'string' && permission.indexOf('https://keys') === 0;
         });
+        // remove last '/' from url due to required syntax in manifest
+        cloudUrl = cloudUrl.substring(0, cloudUrl.length - 1);
+        // get client ID for OAuth requests
         clientId = manifest.oauth2.client_id;
     } catch (e) {}
 
diff --git a/src/manifest.json b/src/manifest.json
index 4a81d02..275c05e 100644
--- a/src/manifest.json
+++ b/src/manifest.json
@@ -12,7 +12,7 @@
       "fileSystem": ["write"]
     },
     "notifications",
-    "https://keys-test.whiteout.io",
+    "https://keys-test.whiteout.io/",
     "identity", {
       "socket": [
         "tcp-connect:imap.gmail.com:993",