diff --git a/includes/class-wc-ajax.php b/includes/class-wc-ajax.php
index 545d734b134..5fc2389c85d 100644
--- a/includes/class-wc-ajax.php
+++ b/includes/class-wc-ajax.php
@@ -96,7 +96,7 @@ class WC_AJAX {
 					'div.widget_shopping_cart_content' => '<div class="widget_shopping_cart_content">' . $mini_cart . '</div>'
 				)
 			),
-			'cart_hash' => WC()->cart->get_cart() ? md5( json_encode( WC()->cart->get_cart() ) ) : ''
+			'cart_hash' => apply_filters( 'add_to_cart_cart_hash', WC()->cart->get_cart() ? md5( json_encode( WC()->cart->get_cart() ) ) : '', WC()->cart->get_cart() )
 		);
 
 		wp_send_json( $data );