diff --git a/includes/admin/importers/class-wc-product-csv-importer-controller.php b/includes/admin/importers/class-wc-product-csv-importer-controller.php
index 2e1a6d4143d..22b70555917 100644
--- a/includes/admin/importers/class-wc-product-csv-importer-controller.php
+++ b/includes/admin/importers/class-wc-product-csv-importer-controller.php
@@ -577,6 +577,7 @@ class WC_Product_CSV_Importer_Controller {
 
 		$headers = array();
 		foreach ( $raw_headers as $key => $field ) {
+			$field             = strtolower( $field );
 			$index             = $num_indexes ? $key : $field;
 			$headers[ $index ] = $field;