diff --git a/include/sqlpp11/basic_expression_operators.h b/include/sqlpp11/basic_expression_operators.h
index aa9ac7c9..23cfcdbc 100644
--- a/include/sqlpp11/basic_expression_operators.h
+++ b/include/sqlpp11/basic_expression_operators.h
@@ -59,7 +59,9 @@ namespace sqlpp
   template <typename LhsType, typename... RhsType>
   using check_rhs_in_operands_t = static_combined_check_t<
       static_check_t<logic::all_t<is_expression_t<sqlpp::wrap_operand_t<RhsType>>::value...>::value,
-                     assert_comparison_valid_rhs_operand_t>>;
+                     assert_comparison_valid_rhs_operand_t>,
+      static_check_t<logic::none_t<std::is_same<LhsType, RhsType>::value...>::value,
+                     assert_comparison_lhs_rhs_differ_t>>;
 
   namespace detail
   {