diff --git a/plugins/woocommerce/src/Internal/DataStores/Orders/DataSynchronizer.php b/plugins/woocommerce/src/Internal/DataStores/Orders/DataSynchronizer.php
index 8ff71b928c1..f1021130b8c 100644
--- a/plugins/woocommerce/src/Internal/DataStores/Orders/DataSynchronizer.php
+++ b/plugins/woocommerce/src/Internal/DataStores/Orders/DataSynchronizer.php
@@ -398,6 +398,8 @@ ORDER BY orders.id ASC
 			return;
 		}
 
+		$batch = array_map( 'absint', $batch );
+
 		$this->order_cache_controller->temporarily_disable_orders_cache_usage();
 
 		$custom_orders_table_is_authoritative = $this->custom_orders_table_is_authoritative();