Different constexpr behavior vs2015u2 vs gcc

I have std::tuple filled with objects instantiated from class template with one type parameter. Now I want to get in compile time an element with specified type parameter from my tuple. Here is the code.

template<typename Params, typename Descriptor>
struct IsParamsEqual;

template<typename Params1, typename Params2, ApiCommand::Value value>
struct IsParamsEqual<Params1, Descriptor<value, Params2>>
{
    static constexpr bool v = std::is_same<Params1, Params2>::value;
};

template<typename Params, size_t I, typename... Args>
constexpr size_t getIndexByParamsHelper(const IndexSequence<I>&, const std::tuple<Args...> &)
{
    return I;
}

template<typename Params, size_t I, size_t... Indexes, typename... Args>
constexpr size_t getIndexByParamsHelper(const IndexSequence<I, Indexes...> &, 
                                        const std::tuple<Args...> &tuple)
{
    return IsParamsEqual<Params, typename std::tuple_element<I, std::tuple<Args...>>::type>::v ?
           I : getIndexByParamsHelper<Params>(IndexSequence<Indexes...>(), tuple);
}

template<typename Params, size_t... Indexes, typename... Args>
constexpr size_t getIndexByParams(const IndexSequence<Indexes...> &seq, 
                                  const std::tuple<Args...> &tuple)
{
    return getIndexByParamsHelper<Params>(seq, tuple);
}

template<typename Params, typename... Args>
constexpr auto getByParamsImpl(const std::tuple<Args...> &tuple)
{
    constexpr size_t I = getIndexByParams<Params>(
        typename MakeIndexSequence<sizeof...(Args)>::type(), tuple);
    static_assert(std::is_same<typename std::remove_reference<decltype(
         std::get<I>(tuple))>::type::paramType, Params>::value,
         "Param not found");
    return std::get<I>(tuple);
}

This compiles fine on gcc 4.8.4 but not on vs2015u2. The error is in the getByParamsImpl() and it says:

error C2131: expression did not evaluate to a constant
note: failure was caused by non-constant arguments or reference to a non-constant symbol
see usage of 'I'

Obviously, compiler thinks that getIndexByParams() return value is not constexpr. The question is why and more important how this can be fixed?