diff --git a/config.default.json b/config.default.json
new file mode 100644
index 0000000..385d278
--- /dev/null
+++ b/config.default.json
@@ -0,0 +1,20 @@
+// Gulp will remove all comments
+{
+  "reverseGeocodingApi": "https://nominatim.openstreetmap.org/reverse",
+  "maxAge": 14,
+  "maxAgeAlert": 3,
+  "nodeZoom": 18,
+  "labelZoom": 13,
+  "clientZoom": 15,
+  "nodeInfobox": {
+    "contact": false,
+    "hardwareUsage": true
+  },
+  "supportedLocale": [
+    "en",
+    "de",
+    "fr",
+    "ru"
+  ],
+  "cacheBreaker": "<!-- inject:cache-breaker -->"
+}
diff --git a/config.json b/config.json
index 0fe63e4..c645126 100644
--- a/config.json
+++ b/config.json
@@ -25,17 +25,7 @@
   ],
   // String or array of data provider are supported
   "dataPath": "https://regensburg.freifunk.net/data/",
-  "reverseGeocodingApi": "https://nominatim.openstreetmap.org/reverse",
   "siteName": "Freifunk Regensburg",
-  "maxAge": 14,
-  "maxAgeAlert": 3,
-  "nodeZoom": 18,
-  "labelZoom": 13,
-  "clientZoom": 15,
-  "nodeInfobox": {
-    "contact": false,
-    "hardwareUsage": true
-  },
   "mapLayers": [
     {
       "name": "Freifunk Regensburg",
@@ -44,7 +34,7 @@
       "config": {
         "maxZoom": 22,
         "subdomains": "1234",
-        "attribution": "<a href=\'https://www.mapbox.com/about/maps/\' target=\'_blank\'>&copy; Mapbox</a> <a href=\'https://openstreetmap.org/about/\' target=\'_blank\'>&copy; OpenStreetMap</a> <a class=\'mapbox-improve-map\' href=\'https://www.mapbox.com/map-feedback/\' target=\'_blank\'>Improve this map</a>",
+        "attribution": "<a href=\"https://www.mapbox.com/about/maps/\" target=\"_blank\">&copy; Mapbox</a> <a href=\"https://openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap</a> <a class=\"mapbox-improve-map\" href=\"https://www.mapbox.com/map-feedback/\" target=\"_blank\">Improve this map</a>",
         "start": 6
       }
     },
@@ -55,7 +45,7 @@
       "config": {
         "maxZoom": 22,
         "subdomains": "1234",
-        "attribution": "<a href=\'https://www.mapbox.com/about/maps/\' target=\'_blank\'>&copy; Mapbox</a> <a href=\'https://openstreetmap.org/about/\' target=\'_blank\'>&copy; OpenStreetMap</a> <a class=\'mapbox-improve-map\' href=\'https://www.mapbox.com/map-feedback/\' target=\'_blank\'>Improve this map</a>",
+        "attribution": "<a href=\"https://www.mapbox.com/about/maps/\" target=\"_blank\">&copy; Mapbox</a> <a href=\"https://openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap</a> <a class=\"mapbox-improve-map\" href=\"https://www.mapbox.com/map-feedback/\" target=\"_blank\">Improve this map</a>",
         "mode": "night",
         "start": 19,
         "end": 7
@@ -121,12 +111,5 @@
       "site": "ffrgb",
       "name": "Regensburg"
     }
-  ],
-  "supportedLocale": [
-    "en",
-    "de",
-    "fr",
-    "ru"
-  ],
-  "cacheBreaker": "<!-- inject:cache-breaker -->"
+  ]
 }
diff --git a/gulp/config.js b/gulp/config.js
index f34cd8e..20001c1 100644
--- a/gulp/config.js
+++ b/gulp/config.js
@@ -8,7 +8,7 @@ module.exports = function () {
       sass: 'scss/**/*.scss',
       javascript: ['app.js', 'lib/**/*.js'],
       json: 'locale/*.json',
-      html: ['html/index.html', 'config.json']
+      html: ['html/index.html', 'config.json', 'config.default.json']
     },
     clean: [build + '/*.map', build + '/vendor', build + '/main.css'],
     autoprefixer: ['> 1% in DE'],
diff --git a/gulp/tasks/html.js b/gulp/tasks/html.js
index 4994e6d..6f33537 100644
--- a/gulp/tasks/html.js
+++ b/gulp/tasks/html.js
@@ -4,9 +4,14 @@ module.exports = function (gulp, plugins, config, env) {
     return gulp.src(env.production() ? config.build + '/*.html' : 'html/*.html')
       .pipe(plugins.inject(gulp.src(['config.json']), {
         starttag: '<!-- inject:config -->',
-        transform: function (filePath, file) {
+        transform: function (filePath, customConfig) {
+          var defaultConfig = fs.readFileSync('config.default.json', 'utf8');
+          var buildConfig = Object.assign(
+            JSON.parse(JSON.minify(defaultConfig)),
+            JSON.parse(JSON.minify(customConfig.contents.toString('utf8')))
+          );
           return '<script>var jsonData =' +
-            file.contents.toString('utf8')
+            JSON.stringify(buildConfig)
               .replace('<!-- inject:cache-breaker -->',
                 Math.random().toString(12).substring(7)) +
             ';</script>'