diff --git a/include/etl/expected.h b/include/etl/expected.h
index 0dc5c059..9fb43f2c 100644
--- a/include/etl/expected.h
+++ b/include/etl/expected.h
@@ -1166,6 +1166,22 @@ bool operator !=(const etl::expected<TValue, TError>& lhs, const etl::unexpected
   return !(lhs == rhs);
 }
 
+//*******************************************
+template <typename TError, typename TError2>
+ETL_CONSTEXPR14
+bool operator !=(const etl::expected<void, TError>& lhs, const etl::expected<void, TError2>& rhs)
+{
+  return !(lhs == rhs);
+}
+
+//*******************************************
+template <typename TError, typename TError2>
+ETL_CONSTEXPR14
+bool operator !=(const etl::expected<void, TError>& lhs, const etl::unexpected<TError2>& rhs)
+{
+  return !(lhs == rhs);
+}
+
 //*******************************************
 template <typename TError, typename TError2>
 ETL_CONSTEXPR14