diff --git a/driver.rkt b/driver.rkt
index 8659ce0..8f94a83 100644
--- a/driver.rkt
+++ b/driver.rkt
@@ -95,8 +95,8 @@
 	       'not-truncated
 	       (dns-message-recursion-desired r1)
 	       'no-recursion-available
-	       (if (and (eqv? (dns-message-authoritative r1) 'name-error)
-			(eqv? (dns-message-authoritative r2) 'name-error))
+	       (if (and (eqv? (dns-message-response-code r1) 'name-error)
+			(eqv? (dns-message-response-code r2) 'name-error))
 		   'name-error
 		   'no-error)
 	       (dns-message-questions r1)