diff --git a/commands/core/outputformat.drush.inc b/commands/core/outputformat.drush.inc
index 5fbd720cdf..5b26b2778a 100644
--- a/commands/core/outputformat.drush.inc
+++ b/commands/core/outputformat.drush.inc
@@ -208,6 +208,7 @@ function outputformat_drush_engine_outputformat() {
     'machine-parsable' => TRUE,
     'engine-class' => 'list',
     'list-item-type' => 'nested-csv',
+    'labeled-list' => TRUE,
     'description' => 'A list of values, one per row, each of which is a comma-separated list of values.',
     'engine-capabilities' => array('format-table'),
     'topic-example' => array(array('a', 12, 'a@one.com'),array('b', 17, 'b@two.com')),
diff --git a/commands/core/outputformat/list.inc b/commands/core/outputformat/list.inc
index cb56f685ab..c46da3f0f1 100644
--- a/commands/core/outputformat/list.inc
+++ b/commands/core/outputformat/list.inc
@@ -106,7 +106,7 @@ class drush_outputformat_list extends drush_outputformat {
       }
 
       // Include field labels, if specified
-      if (!isset($metadata['list-item']) && is_array($input) && isset($metadata['field-labels'])) {
+      if (!isset($metadata['list-item']) && isset($metadata['labeled-list']) && is_array($input) && isset($metadata['field-labels'])) {
         if (isset($metadata['include-field-labels']) && $metadata['include-field-labels']) {
           array_unshift($input, $metadata['field-labels']);
         }