diff --git a/relay_test.go b/relay_test.go
index 220249d..a2a529e 100644
--- a/relay_test.go
+++ b/relay_test.go
@@ -299,7 +299,7 @@ func TestUnspecificRelayDialFails(t *testing.T) {
 		}
 	}()
 
-	addr := ma.StringCast(fmt.Sprintf("/p2p-circuit"))
+	addr := ma.StringCast("/p2p-circuit")
 
 	rctx, rcancel := context.WithTimeout(ctx, time.Second)
 	defer rcancel()
diff --git a/util.go b/util.go
index 92ebb1a..4435e0b 100644
--- a/util.go
+++ b/util.go
@@ -101,7 +101,7 @@ func (d *delimitedReader) ReadMsg(msg proto.Message) error {
 	}
 
 	if uint64(len(d.buf)) < mlen {
-		return errors.New("Message too large")
+		return errors.New("message too large")
 	}
 
 	buf := d.buf[:mlen]