diff --git a/vtkm/exec/internal/testing/UnitTestVariant.cxx b/vtkm/exec/internal/testing/UnitTestVariant.cxx
index 25dcfd32a..64834a369 100644
--- a/vtkm/exec/internal/testing/UnitTestVariant.cxx
+++ b/vtkm/exec/internal/testing/UnitTestVariant.cxx
@@ -444,6 +444,8 @@ void TestCastAndCall()
 
   variant1.CastAndCall(TestFunctorModify{}, 1);
   VTKM_TEST_ASSERT(variant1.Get<1>().Value == 2, "Variant object not updated.");
+
+  variant1.CastAndCall([](auto& object) { ++object.Value; });
 }
 
 void TestCopyInvalid()
diff --git a/vtkm/internal/VariantImpl.h b/vtkm/internal/VariantImpl.h
index 5533477cc..7e586b6de 100644
--- a/vtkm/internal/VariantImpl.h
+++ b/vtkm/internal/VariantImpl.h
@@ -510,7 +510,6 @@ public:
   template <typename Functor, typename... Args>
   VTK_M_DEVICE auto CastAndCall(Functor&& f, Args&&... args) const
     noexcept(noexcept(f(std::declval<const TypeAt<0>&>(), args...)))
-      -> decltype(f(std::declval<const TypeAt<0>&>(), args...))
   {
     VTKM_ASSERT(this->IsValid());
     return detail::VariantCastAndCallImpl<sizeof...(Ts)>(
@@ -521,7 +520,6 @@ public:
   VTK_M_DEVICE auto CastAndCall(Functor&& f,
                                 Args&&... args) noexcept(noexcept(f(std::declval<TypeAt<0>&>(),
                                                                     args...)))
-    -> decltype(f(std::declval<TypeAt<0>&>(), args...))
   {
     VTKM_ASSERT(this->IsValid());
     return detail::VariantCastAndCallImpl<sizeof...(Ts)>(