diff --git a/jsm.go b/jsm.go
index fb7851e48..ae2fa1e98 100644
--- a/jsm.go
+++ b/jsm.go
@@ -95,10 +95,18 @@ type Placement struct {
 
 // StreamSource dictates how streams can source from other streams.
 type StreamSource struct {
-	Name          string     `json:"name"`
-	OptStartSeq   uint64     `json:"opt_start_seq,omitempty"`
-	OptStartTime  *time.Time `json:"opt_start_time,omitempty"`
-	FilterSubject string     `json:"filter_subject,omitempty"`
+	Name          string          `json:"name"`
+	OptStartSeq   uint64          `json:"opt_start_seq,omitempty"`
+	OptStartTime  *time.Time      `json:"opt_start_time,omitempty"`
+	FilterSubject string          `json:"filter_subject,omitempty"`
+	External      *ExternalStream `json:"external,omitempty"`
+}
+
+// ExternalStream allows you to qualify access to a stream source in another
+// account.
+type ExternalStream struct {
+	ApiPrefix     string `json:"api"`
+	DeliverPrefix string `json:"deliver"`
 }
 
 // apiError is included in all API responses if there was an error.
diff --git a/test/js_test.go b/test/js_test.go
index 902c147f8..9c5e4dfe0 100644
--- a/test/js_test.go
+++ b/test/js_test.go
@@ -1695,6 +1695,135 @@ func TestJetStreamImportDirectOnly(t *testing.T) {
 	}
 }
 
+func TestJetStreamCrossAccountMirrorsAndSources(t *testing.T) {
+	conf := createConfFile(t, []byte(`
+		listen: 127.0.0.1:-1
+		no_auth_user: rip
+		jetstream: {max_mem_store: 64GB, max_file_store: 10TB}
+		accounts {
+			JS {
+				jetstream: enabled
+				users = [ { user: "rip", pass: "pass" } ]
+				exports [
+					{ service: "$JS.API.CONSUMER.>" } # To create internal consumers to mirror/source.
+					{ stream: "RI.DELIVER.SYNC.>" }   # For the mirror/source consumers sending to IA via delivery subject.
+				]
+			}
+			IA {
+				jetstream: enabled
+				users = [ { user: "dlc", pass: "pass" } ]
+				imports [
+					{ service: { account: JS, subject: "$JS.API.CONSUMER.>"}, to: "RI.JS.API.CONSUMER.>" }
+					{ stream: { account: JS, subject: "RI.DELIVER.SYNC.>"} }
+				]
+			}
+			$SYS { users = [ { user: "admin", pass: "s3cr3t!" } ] }
+		}
+	`))
+	defer os.Remove(conf)
+
+	s, _ := RunServerWithConfig(conf)
+	defer s.Shutdown()
+
+	if config := s.JetStreamConfig(); config != nil {
+		defer os.RemoveAll(config.StoreDir)
+	}
+
+	nc1, err := nats.Connect(s.ClientURL(), nats.UserInfo("rip", "pass"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer nc1.Close()
+	js1, err := nc1.JetStream()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = js1.AddStream(&nats.StreamConfig{
+		Name:     "TEST",
+		Replicas: 2,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	toSend := 100
+	for i := 0; i < toSend; i++ {
+		if _, err := js1.Publish("TEST", []byte("OK")); err != nil {
+			t.Fatalf("Unexpected publish error: %v", err)
+		}
+	}
+
+	nc2, err := nats.Connect(s.ClientURL(), nats.UserInfo("dlc", "pass"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer nc2.Close()
+	js2, err := nc1.JetStream()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	checkMsgCount := func(t *testing.T, js nats.JetStreamManager, timeout time.Duration, want int) {
+		t.Helper()
+
+		deadline := time.Now().Add(timeout)
+		var loopErr error
+		for time.Now().Before(deadline) {
+			si, err := js2.StreamInfo("MY_MIRROR_TEST")
+			if err != nil {
+				loopErr = err
+				continue
+			}
+			loopErr = nil
+
+			if got := int(si.State.Msgs); got != want {
+				loopErr = fmt.Errorf("Unexpected msg count, got %d, want %d", got, want)
+				continue
+			}
+			loopErr = nil
+			break
+		}
+		if loopErr != nil {
+			t.Fatal(loopErr)
+		}
+	}
+
+	_, err = js2.AddStream(&nats.StreamConfig{
+		Name:    "MY_MIRROR_TEST",
+		Storage: nats.FileStorage,
+		Mirror: &nats.StreamSource{
+			Name: "TEST",
+			External: &nats.ExternalStream{
+				ApiPrefix:     "RI.JS.API",
+				DeliverPrefix: "RI.DELIVER.SYNC.MIRRORS",
+			},
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	checkMsgCount(t, js2, 2*time.Second, toSend)
+
+	_, err = js2.AddStream(&nats.StreamConfig{
+		Name:    "MY_SOURCE_TEST",
+		Storage: nats.FileStorage,
+		Sources: []*nats.StreamSource{
+			&nats.StreamSource{
+				Name: "TEST",
+				External: &nats.ExternalStream{
+					ApiPrefix:     "RI.JS.API",
+					DeliverPrefix: "RI.DELIVER.SYNC.SOURCES",
+				},
+			},
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	checkMsgCount(t, js2, 2*time.Second, toSend)
+}
+
 func TestJetStreamAutoMaxAckPending(t *testing.T) {
 	s := RunBasicJetStreamServer()
 	defer s.Shutdown()