diff --git a/src/WooCommerce/Checkout.php b/src/WooCommerce/Checkout.php
index 0cbe132..c51ece2 100644
--- a/src/WooCommerce/Checkout.php
+++ b/src/WooCommerce/Checkout.php
@@ -93,7 +93,7 @@ public function apply_coupon_via_url() {
 			return;
 		}
 
-		WC()->cart->add_discount( wc_clean( $coupon_code ) );
+		WC()->cart->add_discount( wc_sanitize_coupon_code( $coupon_code ) );
 	}
 
 	/**