diff --git a/src/AdminPaymentFormPostType.php b/src/AdminPaymentFormPostType.php
index f62d825..6005bd6 100644
--- a/src/AdminPaymentFormPostType.php
+++ b/src/AdminPaymentFormPostType.php
@@ -191,7 +191,7 @@ public function insert_post_data( $data, $postarr ) {
 		}
 
 		// If this is an autosave, our form has not been submitted, so we don't want to do anything.
-		if ( \defined( '\DOING_AUTOSAVE' ) && \DOING_AUTOSAVE ) {
+		if ( \defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
 			return $data;
 		}