diff --git a/includes/class-wc-ajax.php b/includes/class-wc-ajax.php
index ef9df75ddb1..865d7074b72 100644
--- a/includes/class-wc-ajax.php
+++ b/includes/class-wc-ajax.php
@@ -942,7 +942,7 @@ class WC_AJAX {
 			}
 		}
 
-		delete_transient( 'wc_product_children_ids_' . $post_id );
+		delete_transient( 'wc_product_children_ids_' . $post_id . WC_Cache_Helper::get_transient_version( 'product' ) );
 
 		echo $added;
 
@@ -2045,7 +2045,7 @@ class WC_AJAX {
 		if ( $refund_id && 'shop_order_refund' === get_post_type( $refund_id ) ) {
 			wc_delete_shop_order_transients( wp_get_post_parent_id( $refund_id ) );
 			wp_delete_post( $refund_id );
-			
+
 			do_action( 'woocommerce_refund_deleted', $refund_id );
 		}