Index: module_builder.drush.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/module_builder/drush/module_builder.drush.inc,v
retrieving revision 1.2.4.4
diff -u -p -r1.2.4.4 module_builder.drush.inc
--- module_builder.drush.inc	26 Jan 2011 20:17:44 -0000	1.2.4.4
+++ module_builder.drush.inc	3 Feb 2011 13:39:55 -0000
@@ -317,7 +317,7 @@ function module_builder_build_data($comm
     }
     
     // Third pass: set a default value from the definition or a callback.
-    if (isset($definition['default'])) {
+    if (empty($module_data[$name] && isset($definition['default'])) {
       $module_data[$name] = $definition['default'];
     }
     elseif (isset($definition['default_callback'])) {