diff --git a/woocommerce/checkout/form-checkout.php b/woocommerce/checkout/form-checkout.php
index a414b9c..7081da9 100644
--- a/woocommerce/checkout/form-checkout.php
+++ b/woocommerce/checkout/form-checkout.php
@@ -34,7 +34,7 @@ if ( ! $checkout->is_registration_enabled() && $checkout->is_registration_requir
 
 <form name="checkout" method="post" class="checkout woocommerce-checkout" action="<?php echo esc_url( wc_get_checkout_url() ); ?>" enctype="multipart/form-data">
 
-	<?php if ( sizeof( $checkout->checkout_fields ) > 0 ) : ?>
+	<?php if ( $checkout->get_checkout_fields() ) : ?>
 
 		<?php do_action( 'woocommerce_checkout_before_customer_details' ); ?>