diff --git a/Eigen/src/Array/Array.h b/Eigen/src/Array/Array.h
index 91a091152..8a53b8c3e 100644
--- a/Eigen/src/Array/Array.h
+++ b/Eigen/src/Array/Array.h
@@ -44,6 +44,9 @@ class Array
     typedef typename Base::PlainObject PlainObject;
 
   protected:
+    template <typename Derived, typename OtherDerived, bool IsVector>
+    friend struct ei_conservative_resize_like_impl;
+
     using Base::m_storage;
   public:
     enum { NeedsToAlign = (!(Options&DontAlign))