diff --git a/libcxx/test/std/ranges/range.adaptors/range.zip/types.h b/libcxx/test/std/ranges/range.adaptors/range.zip/types.h
--- a/libcxx/test/std/ranges/range.adaptors/range.zip/types.h
+++ b/libcxx/test/std/ranges/range.adaptors/range.zip/types.h
@@ -319,7 +319,7 @@
   }
   constexpr void operator++(int) { ++it_; }
 
-  constexpr int& operator*() const { return *it_; }
+  constexpr auto& operator*() const { return *it_; }
 
   friend constexpr bool operator==(common_input_iterator const&, common_input_iterator const&) = default;
 };