diff -u b/libraries.drush.inc b/libraries.drush.inc
--- b/libraries.drush.inc
+++ b/libraries.drush.inc
@@ -141,13 +141,13 @@
       // for re-downloading.
       drush_set_context('DRUSH_AFFIRMATIVE', TRUE);
 
-      foreach ($downloaded as $name) {
-        if (drush_delete_dir($libraries[$name], TRUE)) {
+      foreach ($downloaded as $machine_name => $name) {
+        if (drush_delete_dir($libraries[$machine_name], TRUE)) {
           // Allow to re-download successfully deleted libraries only.
-          $download[$name] = $info[$name];
+          $download[$machine_name] = $info[$machine_name];
         }
         else {
-          drush_log(dt('Cannot remove the "!dir" directory.', array('!dir' => $libraries[$name])), 'error');
+          drush_log(dt('Cannot remove the "!dir" directory.', array('!dir' => $libraries[$machine_name])), 'error');
         }
       }
 
@@ -206,7 +206,7 @@
       }
     }
     else {
-      $downloaded[] = $name;
+      $downloaded[$name] = $library['name'];
     }
   }