--- node_import/supported/cck/content.inc
+++ node_import/supported/cck/content.inc
@@ -230,7 +230,7 @@
               $node->$field_name += array('nids' => $nids);
             }
             else {
-              $node->$field_name += array('nid' => reset($nids));
+              $node->$field_name += array('nids' => array_unshift($nids));
             }
             break;