src/net/dnsclient_unix_test.go | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/net/lookup_unix.go         | 16 +++++++++++++---

diff --git a/src/net/dnsclient_unix_test.go b/src/net/dnsclient_unix_test.go
index 9e4ebcc7bbef890b4761dff9078e7f0bb29dd7d4..9482fc466f44342182292398cb6f76f2bb23893c 100644
--- a/src/net/dnsclient_unix_test.go
+++ b/src/net/dnsclient_unix_test.go
@@ -1568,3 +1568,56 @@ 	if err != nil {
 		t.Fatal("exhange failed:", err)
 	}
 }
+
+// Issue 27763: verify that two strings in one TXT record are concatenated.
+func TestTXTRecordTwoStrings(t *testing.T) {
+	fake := fakeDNSServer{
+		rh: func(n, _ string, q dnsmessage.Message, _ time.Time) (dnsmessage.Message, error) {
+			r := dnsmessage.Message{
+				Header: dnsmessage.Header{
+					ID:       q.Header.ID,
+					Response: true,
+					RCode:    dnsmessage.RCodeSuccess,
+				},
+				Questions: q.Questions,
+				Answers: []dnsmessage.Resource{
+					{
+						Header: dnsmessage.ResourceHeader{
+							Name:  q.Questions[0].Name,
+							Type:  dnsmessage.TypeA,
+							Class: dnsmessage.ClassINET,
+						},
+						Body: &dnsmessage.TXTResource{
+							TXT: []string{"string1 ", "string2"},
+						},
+					},
+					{
+						Header: dnsmessage.ResourceHeader{
+							Name:  q.Questions[0].Name,
+							Type:  dnsmessage.TypeA,
+							Class: dnsmessage.ClassINET,
+						},
+						Body: &dnsmessage.TXTResource{
+							TXT: []string{"onestring"},
+						},
+					},
+				},
+			}
+			return r, nil
+		},
+	}
+	r := Resolver{PreferGo: true, Dial: fake.DialContext}
+	txt, err := r.lookupTXT(context.Background(), "golang.org")
+	if err != nil {
+		t.Fatal("LookupTXT failed:", err)
+	}
+	if want := 2; len(txt) != want {
+		t.Fatalf("len(txt), got %d, want %d", len(txt), want)
+	}
+	if want := "string1 string2"; txt[0] != want {
+		t.Errorf("txt[0], got %q, want %q", txt[0], want)
+	}
+	if want := "onestring"; txt[1] != want {
+		t.Errorf("txt[1], got %q, want %q", txt[1], want)
+	}
+}
diff --git a/src/net/lookup_unix.go b/src/net/lookup_unix.go
index 2c3191aca8a66801c51acab72f18479e7d799dc9..f55ef5969eb16b4d0947dff52fe74e420cb85aeb 100644
--- a/src/net/lookup_unix.go
+++ b/src/net/lookup_unix.go
@@ -299,11 +299,21 @@ 				Name:   name,
 				Server: server,
 			}
 		}
+		// Multiple strings in one TXT record need to be
+		// concatenated without separator to be consistent
+		// with previous Go resolver.
+		n := 0
+		for _, s := range txt.TXT {
+			n += len(s)
+		}
+		txtJoin := make([]byte, 0, n)
+		for _, s := range txt.TXT {
+			txtJoin = append(txtJoin, s...)
+		}
 		if len(txts) == 0 {
-			txts = txt.TXT
-		} else {
-			txts = append(txts, txt.TXT...)
+			txts = make([]string, 0, 1)
 		}
+		txts = append(txts, string(txtJoin))
 	}
 	return txts, nil
 }