diff --git a/test/itestvalue.hpp b/test/itestvalue.hpp
index b45bdd8..4fd6750 100644
--- a/test/itestvalue.hpp
+++ b/test/itestvalue.hpp
@@ -380,6 +380,9 @@ struct testvalue
    bool operator==(const testvalue &other) const
    {  return value_ == other.value_;  }
 
+   bool operator!=(const testvalue &other) const
+   {  return value_ != other.value_;  }
+
    friend bool operator< (int other1, const testvalue &other2)
    {  return other1 < other2.value_;  }
 
@@ -391,6 +394,12 @@ struct testvalue
 
    friend bool operator== (const testvalue &other1, int other2)
    {  return other1.value_ == other2;  }
+
+   friend bool operator!= (int other1, const testvalue &other2)
+   {  return other1 != other2.value_;  }
+
+   friend bool operator!= (const testvalue &other1, int other2)
+   {  return other1.value_ != other2;  }
 };
 
 template<class VoidPointer, bool ConstantTimeSize>