diff --git a/Chaos/Hash/Hash.hpp b/Chaos/Hash/Hash.hpp
index 402e572..fe252e1 100644
--- a/Chaos/Hash/Hash.hpp
+++ b/Chaos/Hash/Hash.hpp
@@ -20,6 +20,9 @@ public:
         return Impl().ToHexString();
     }
 
+protected:
+    Hash() = default;
+
 private:
     const T & Impl() const
     {
diff --git a/Chaos/Hash/Hasher.hpp b/Chaos/Hash/Hasher.hpp
index 02e97ac..796c02f 100644
--- a/Chaos/Hash/Hasher.hpp
+++ b/Chaos/Hash/Hasher.hpp
@@ -24,6 +24,9 @@ public:
         return Impl().Finish();
     }
 
+protected:
+    Hasher() = default;
+
 private:
     const T & Impl() const
     {