--- a/plugins/FeedsNodeProcessor.inc
+++ b/plugins/FeedsNodeProcessor.inc
@@ -279,6 +279,11 @@ class FeedsNodeProcessor extends FeedsProcessor {
             $nid = db_query("SELECT fs.feed_nid FROM {node} n JOIN {feeds_source} fs ON n.nid = fs.feed_nid WHERE fs.id = :id AND fs.source = :source", array(':id' => $id, ':source' => $value))->fetchField();
           }
           break;
+        default:
+          if (module_exists('unique_field')) {
+            $scope = variable_get('unique_field_scope_'. $this->config['content_type'], UNIQUE_FIELD_SCOPE_TYPE);
+            $nid = array_shift(unique_field_match_value($target, array(array('value' => $value)), variable_get('unique_field_scope_'. $this->config['content_type'], $scope)));
+          }
       }
       if ($nid) {
         // Return with the first nid found.