src/net/dnsclient_unix.go | 4 +++-

diff --git a/src/net/dnsclient_unix.go b/src/net/dnsclient_unix.go
index c291d5eb4f20e01e7f92ebad90b54b12338c737d..8b3dd5371aa306dd667fd087547140cf4dc55a8b 100644
--- a/src/net/dnsclient_unix.go
+++ b/src/net/dnsclient_unix.go
@@ -267,7 +267,9 @@ 		}
 		if ahdr.Type == dnsmessage.TypeOPT {
 			return ahdr.ExtendedRCode(hdr.RCode)
 		}
-		p.SkipAdditional()
+		if err := p.SkipAdditional(); err != nil {
+			return hdr.RCode
+		}
 	}
 }