diff --git a/src/RefundsManager.php b/src/RefundsManager.php
index 32b2358..ccb5b48 100644
--- a/src/RefundsManager.php
+++ b/src/RefundsManager.php
@@ -122,7 +122,7 @@ private function process_refund( EDD_Payment $edd_payment, Payment $payment ) {
 		$gateway = $payment->get_gateway();
 
 		if ( null === $gateway ) {
-			throw new Exception( __( 'Unable to process refund because gateway does not exist.', 'pronamic_ideal' ) );
+			throw new \Exception( \esc_html__( 'Unable to process refund because gateway does not exist.', 'pronamic_ideal' ) );
 		}
 
 		// Transaction ID.