diff --git a/lib/src/kdbx_entry.dart b/lib/src/kdbx_entry.dart
index d1e5783..07aa6e4 100644
--- a/lib/src/kdbx_entry.dart
+++ b/lib/src/kdbx_entry.dart
@@ -57,6 +57,7 @@ bool kdbxKeyCommonAssertConsistency() {
 class KdbxKey {
   KdbxKey(this.key) : _canonicalKey = key.toLowerCase();
   const KdbxKey._(this.key, this._canonicalKey);
+  const KdbxKey.origin(this.key, this._canonicalKey);
 
   final String key;
   final String _canonicalKey;