diff --git a/include/pybind11/cast.h b/include/pybind11/cast.h
index 977c9897..715ec932 100644
--- a/include/pybind11/cast.h
+++ b/include/pybind11/cast.h
@@ -835,7 +835,7 @@ public:
             nullptr, nullptr, holder);
     }
 
-    template <typename T> using cast_op_type = cast_op_type<T>;
+    template <typename T> using cast_op_type = detail::cast_op_type<T>;
 
     operator itype*() { return (type *) value; }
     operator itype&() { if (!value) throw reference_cast_error(); return *((itype *) value); }