diff --git a/api/array_view.h b/api/array_view.h
index efc642d..bf91484 100644
--- a/api/array_view.h
+++ b/api/array_view.h
@@ -231,6 +231,12 @@
                               HasDataAndSize<U, T>::value>::type* = nullptr>
   ArrayView(U& u)  // NOLINT
       : ArrayView(u.data(), u.size()) {}
+  template <
+      typename U,
+      typename std::enable_if<Size == impl::kArrayViewVarSize &&
+                              HasDataAndSize<U, T>::value>::type* = nullptr>
+  ArrayView(const U& u)  // NOLINT(runtime/explicit)
+      : ArrayView(u.data(), u.size()) {}
 
   // Indexing and iteration. These allow mutation even if the ArrayView is
   // const, because the ArrayView doesn't own the array. (To prevent mutation,