diff --git a/sumdb/note/example_test.go b/sumdb/note/example_test.go
index 21cbc32..9c781ab 100644
--- a/sumdb/note/example_test.go
+++ b/sumdb/note/example_test.go
@@ -93,7 +93,7 @@
 	}
 	verifiers := note.VerifierList(verifier)
 
-	n, err := note.Open([]byte(msg), verifiers)
+	n, err := note.Open(msg, verifiers)
 	if err != nil {
 		fmt.Println(err)
 		return
diff --git a/sumdb/note/note_test.go b/sumdb/note/note_test.go
index 2402471..7b901a5 100644
--- a/sumdb/note/note_test.go
+++ b/sumdb/note/note_test.go
@@ -178,7 +178,7 @@
 
 	s := &signer{
 		name: name,
-		hash: uint32(hash),
+		hash: hash,
 		sign: func(msg []byte) ([]byte, error) {
 			return ed25519.Sign(priv, msg), nil
 		},
diff --git a/sumdb/test.go b/sumdb/test.go
index e4c166d..c2755b8 100644
--- a/sumdb/test.go
+++ b/sumdb/test.go
@@ -107,7 +107,7 @@
 		s.lookup = make(map[string]int64)
 	}
 	s.lookup[key] = id
-	hashes, err := tlog.StoredHashesForRecordHash(id, tlog.RecordHash([]byte(data)), s.hashes)
+	hashes, err := tlog.StoredHashesForRecordHash(id, tlog.RecordHash(data), s.hashes)
 	if err != nil {
 		panic(err)
 	}