diff --git a/Pilz.Cryptography/IUniquieID.cs b/Pilz.Cryptography/IUniquieID.cs
index 87e606c..34bc49e 100644
--- a/Pilz.Cryptography/IUniquieID.cs
+++ b/Pilz.Cryptography/IUniquieID.cs
@@ -11,5 +11,6 @@ namespace Pilz.Cryptography
 
         void GenerateIfNull();
         void Generate();
+        bool Equals(object obj);
     }
 }
diff --git a/Pilz.Cryptography/UniquieID.cs b/Pilz.Cryptography/UniquieID.cs
index 6655afc..ff7ee07 100644
--- a/Pilz.Cryptography/UniquieID.cs
+++ b/Pilz.Cryptography/UniquieID.cs
@@ -92,7 +92,7 @@ namespace Pilz.Cryptography
         {
             var iD = obj as UniquieID<TargetType>;
             return iD != null &&
-                   _iD == iD._iD;
+                   _iD.Equals(iD._iD);
         }
 
         public override int GetHashCode()