diff --git a/field/binary.go b/field/binary.go
index 7c9c3df..6d600c5 100644
--- a/field/binary.go
+++ b/field/binary.go
@@ -134,7 +134,7 @@ func (f *Binary) Unmarshal(v interface{}) error {
 
 			val.SetBytes(f.value)
 		default:
-			return fmt.Errorf("data does not match required reflect.Value type")
+			return fmt.Errorf("unsupported reflect.Value type: %s", val.Kind())
 		}
 	case *string:
 		str := hex.EncodeToString(f.value)