diff --git a/lib/class-importer.php b/lib/class-importer.php
index b83e597..29f5f69 100644
--- a/lib/class-importer.php
+++ b/lib/class-importer.php
@@ -713,7 +713,7 @@ public function import_item( array $data, $parent_post_id = 0, $import_ignored =
 			}
 		}
 		$added_term_relationship = did_action( 'added_term_relationship' );
-		wp_set_object_terms( $post_id, $package_term_ids, $this->taxonomy_package );
+		wp_set_object_terms( $post_id, $package_term_ids, $this->taxonomy_package, true );
 		if ( did_action( 'added_term_relationship' ) > $added_term_relationship ) {
 			$anything_updated[] = true;
 		}