diff --git a/revid/revid_test.go b/revid/revid_test.go
index b8f9c1f7..867ded78 100644
--- a/revid/revid_test.go
+++ b/revid/revid_test.go
@@ -106,7 +106,7 @@ func newDummyMultiWriter(dst ...io.Writer) io.Writer {
 	}
 }
 
-func (w *dummyMultiWriter) Write(d []byte) (int, error) { return 0, nil }
+func (w *dummyMultiWriter) Write(d []byte) (int, error) { return len(d), nil }
 
 // TestResetEncoderSenderSetup checks that revid.reset() correctly sets up the
 // revid.encoder slice and the senders the encoders write to.