diff --git a/vtkm/cont/internal/ArrayPortalFromIterators.h b/vtkm/cont/internal/ArrayPortalFromIterators.h
index ba98f7849..79262f02d 100644
--- a/vtkm/cont/internal/ArrayPortalFromIterators.h
+++ b/vtkm/cont/internal/ArrayPortalFromIterators.h
@@ -172,15 +172,6 @@ public:
   VTKM_EXEC_CONT
   ValueType Get(vtkm::Id index) const { return *this->IteratorAt(index); }
 
-  VTKM_SUPPRESS_EXEC_WARNINGS
-  VTKM_EXEC_CONT
-  void Set(vtkm::Id vtkmNotUsed(index), const ValueType& vtkmNotUsed(value)) const
-  {
-#if !(defined(VTKM_MSVC) && defined(VTKM_CUDA))
-    VTKM_ASSERT(false && "Attempted to write to constant array.");
-#endif
-  }
-
   VTKM_SUPPRESS_EXEC_WARNINGS
   VTKM_EXEC_CONT
   IteratorT GetIteratorBegin() const { return this->BeginIterator; }
diff --git a/vtkm/cont/internal/testing/UnitTestArrayPortalFromIterators.cxx b/vtkm/cont/internal/testing/UnitTestArrayPortalFromIterators.cxx
index af8561c16..5f320cc9e 100644
--- a/vtkm/cont/internal/testing/UnitTestArrayPortalFromIterators.cxx
+++ b/vtkm/cont/internal/testing/UnitTestArrayPortalFromIterators.cxx
@@ -73,6 +73,19 @@ struct TemplatedTests
     ::vtkm::cont::internal::ArrayPortalFromIterators<const ValueType*> const_portal(
       array, array + ARRAY_SIZE);
 
+    using PortalType = decltype(portal);
+    using PortalConstType = decltype(const_portal);
+
+    std::cout << "Check that PortalSupports* results are valid:" << std::endl;
+    VTKM_TEST_ASSERT(vtkm::internal::PortalSupportsSets<PortalType>::value,
+                     "Writable portals should support Set operations");
+    VTKM_TEST_ASSERT(vtkm::internal::PortalSupportsGets<PortalType>::value,
+                     "Writable portals should support Get operations");
+    VTKM_TEST_ASSERT(!vtkm::internal::PortalSupportsSets<PortalConstType>::value,
+                     "Read-only portals should not allow Set operations");
+    VTKM_TEST_ASSERT(vtkm::internal::PortalSupportsGets<PortalConstType>::value,
+                     "Read-only portals should support Get operations");
+
     std::cout << "  Check that ArrayPortalToIterators is not doing indirection." << std::endl;
     // If you get a compile error here about mismatched types, it might be
     // that ArrayPortalToIterators is not properly overloaded to return the