diff --git a/merkle/types.go b/merkle/types.go
index 1a6d75e0c..3881f3793 100644
--- a/merkle/types.go
+++ b/merkle/types.go
@@ -21,3 +21,7 @@ type Tree interface {
 type Hasher interface {
 	Hash() []byte
 }
+
+type Byteser interface {
+	Bytes() []byte
+}