diff --git a/vtkm/internal/ArrayPortalValueReference.h b/vtkm/internal/ArrayPortalValueReference.h
index e7f849d31..ea6790c2f 100644
--- a/vtkm/internal/ArrayPortalValueReference.h
+++ b/vtkm/internal/ArrayPortalValueReference.h
@@ -61,7 +61,7 @@ struct ArrayPortalValueReference
 
   VTKM_SUPPRESS_EXEC_WARNINGS
   VTKM_EXEC_CONT
-  operator ValueType(void) const { return this->Get(); }
+  operator ValueType() const { return this->Get(); }
 
   // Declaring Set as const seems a little weird because we are changing the value. But remember
   // that ArrayPortalReference is only a reference class. The reference itself does not change,