diff --git a/libcxx/include/valarray b/libcxx/include/valarray
--- a/libcxx/include/valarray
+++ b/libcxx/include/valarray
@@ -1328,7 +1328,6 @@
         {}
 
     template <class> friend class valarray;
-    template <class> friend class sliceExpr;
 };
 
 template <class _Tp>