diff --git a/i18n/create_messages.py b/i18n/create_messages.py
index dc2620a31..24d739374 100755
--- a/i18n/create_messages.py
+++ b/i18n/create_messages.py
@@ -42,7 +42,7 @@ def load_constants(filename):
   for key in constant_defs:
     value = constant_defs[key]
     value = value.replace('"', '\\"')
-    constants_text += '\nBlockly.Msg["{0}"] = "{1}";'.format(key, value)
+    constants_text += '\nBlockly.Msg.{0} = \"{1}\";'.format(key, value)  
   return constants_text
 
 def main():
@@ -139,7 +139,7 @@ goog.require('Blockly.Msg');
             value = source_defs[key]
             comment = '  // untranslated'
           value = value.replace('"', '\\"')
-          outfile.write(u'Blockly.Msg["{0}"] = "{1}";{2}\n'.format(
+          outfile.write(u'Blockly.Msg.{0} = "{1}";{2}\n'.format(
               key, value, comment))
 
         # Announce any keys defined only for target language.