Why is this variadic function call ambiguous?

  template<typename FilterComponent, typename ...FilterComponents>
  std::bitset<components_count> component_impl(std::bitset<components_count> &b){
    b.set(FilterComponent::get_id());
    return component_impl<FilterComponents...>(b); //ambiguous
  }
  template<typename FilterComponent>
  std::bitset<components_count> component_impl(std::bitset<components_count> &b){
    b.set(FilterComponent::get_id());
    return b;
  }
  template<typename ...FilterComponents>
  std::bitset<components_count> component_mask(){
    std::bitset<components_count> b;
    component_impl<FilterComponents...>(b);
    return b;
  }

Why is this function call ambiguous? I wanted to call it like component_mask<Foo,Bar,Baz>();

error: call to member function 'component_impl' is ambiguous
    return component_impl<FilterComponents...>(b);