diff --git a/tools/build/build.py b/tools/build/build.py
index 5bd57b80..bcb08748 100755
--- a/tools/build/build.py
+++ b/tools/build/build.py
@@ -22,6 +22,7 @@ def build_oxjs(downloads=False, geo=False):
     build_path = root_path + 'build/'
     dev_path = root_path + 'dev/'
 
+    locales = {}
     version = '0.1.%s' % subprocess.Popen(
         ['bzr', 'revno'],
         stdout=subprocess.PIPE
@@ -116,6 +117,14 @@ def build_oxjs(downloads=False, geo=False):
                 link_target = target.replace(build_path, dev_path)
                 if not is_jquery_min:
                     write_link(link_source, link_target)
+                # locales
+                match = re.search('/Ox\.?(\w*?)/json/locale.(\w+).json', source)
+                if match:
+                    module = match.group(1)
+                    locale = match.group(2)
+                    if not module in locales:
+                        locales[module] = []
+                    locales[module].append(locale)
     # remove dangling links from dev tree that might
     # be left over from renamed or removed files
     for path, dirnames, filenames in os.walk(dev_path):
@@ -159,12 +168,22 @@ def build_oxjs(downloads=False, geo=False):
         js += read_file(source_path + js_dir + filename) + '\n'
         if not js_dir + filename in sum(ox_files, []):
             ox_files[-1].append(js_dir + filename)
-    js = re.sub("Ox.VERSION = '([\d\.]+)'", "Ox.VERSION = '%s'" % version, js)
+    js = re.sub(
+        'Ox.LOCALES = \{\}',
+        'Ox.LOCALES = ' + json.dumps(locales, indent=4, sort_keys=True),
+        js
+    )
+    js = re.sub(
+        "Ox.VERSION = '([\d\.]+)'",
+        "Ox.VERSION = '%s'" % version,
+        js
+    )
     write_file(build_path + 'Ox.js', ox.js.minify(js, comment))
     write_file(dev_path + '/Ox/json/' + 'Ox.json', json.dumps({
         'files': ox_files,
+        'locales': locales,
         'version': version
-    }, indent=4))
+    }, indent=4, sort_keys=True))
 
     # Ox.UI
     js = ''