diff --git a/libcxx/test/std/ranges/range.adaptors/range.join.view/types.h b/libcxx/test/std/ranges/range.adaptors/range.join.view/types.h
--- a/libcxx/test/std/ranges/range.adaptors/range.join.view/types.h
+++ b/libcxx/test/std/ranges/range.adaptors/range.join.view/types.h
@@ -196,29 +196,6 @@
   }
 };
 
-// an `input_iterator` that can be used in a `common_range`
-template <class Base>
-struct common_input_iterator {
-  Base it_;
-
-  using value_type = std::iter_value_t<Base>;
-  using difference_type = std::intptr_t;
-  using iterator_concept = std::input_iterator_tag;
-
-  constexpr common_input_iterator() = default;
-  constexpr explicit common_input_iterator(Base it) : it_(it) {}
-
-  constexpr common_input_iterator& operator++() {
-    ++it_;
-    return *this;
-  }
-  constexpr void operator++(int) { ++it_; }
-
-  constexpr std::iter_reference_t<Base> operator*() const { return *it_; }
-
-  friend constexpr bool operator==(common_input_iterator const&, common_input_iterator const&) = default;
-};
-
 using InputCommonInner = BufferView<common_input_iterator<int*>>;
 static_assert(std::ranges::input_range<InputCommonInner>);
 static_assert(!std::ranges::forward_range<InputCommonInner>);
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
@@ -302,29 +302,7 @@
 static_assert(!std::ranges::common_range<ContiguousNonCommonSized>);
 static_assert(std::ranges::sized_range<ContiguousNonCommonSized>);
 
-template <class Base = int*>
-struct common_input_iterator {
-  Base it_;
-
-  using value_type = int;
-  using difference_type = std::intptr_t;
-  using iterator_concept = std::input_iterator_tag;
-
-  constexpr common_input_iterator() = default;
-  constexpr explicit common_input_iterator(Base it) : it_(it) {}
-
-  constexpr common_input_iterator& operator++() {
-    ++it_;
-    return *this;
-  }
-  constexpr void operator++(int) { ++it_; }
-
-  constexpr int& operator*() const { return *it_; }
-
-  friend constexpr bool operator==(common_input_iterator const&, common_input_iterator const&) = default;
-};
-
-using InputCommonView = BasicView<common_input_iterator<>>;
+using InputCommonView = BasicView<common_input_iterator<int*>>;
 static_assert(std::ranges::input_range<InputCommonView>);
 static_assert(!std::ranges::forward_range<InputCommonView>);
 static_assert(std::ranges::common_range<InputCommonView>);
@@ -337,7 +315,7 @@
 static_assert(std::ranges::common_range<NonSimpleInputCommonView>);
 LIBCPP_STATIC_ASSERT(!std::ranges::__simple_view<NonSimpleInputCommonView>);
 
-using InputNonCommonView = BasicView<common_input_iterator<>, sentinel_wrapper<common_input_iterator<>>>;
+using InputNonCommonView = BasicView<common_input_iterator<int*>, sentinel_wrapper<common_input_iterator<int*>>>;
 static_assert(std::ranges::input_range<InputNonCommonView>);
 static_assert(!std::ranges::forward_range<InputNonCommonView>);
 static_assert(!std::ranges::common_range<InputNonCommonView>);
diff --git a/libcxx/test/support/test_iterators.h b/libcxx/test/support/test_iterators.h
--- a/libcxx/test/support/test_iterators.h
+++ b/libcxx/test/support/test_iterators.h
@@ -697,6 +697,33 @@
 
 static_assert(std::output_iterator<cpp20_output_iterator<int*>, int>);
 
+#  if TEST_STD_VER > 17
+
+// An `input_iterator` that can be used in a `std::ranges::common_range`
+template <class Base>
+struct common_input_iterator {
+  Base it_;
+
+  using value_type       = std::iter_value_t<Base>;
+  using difference_type  = std::intptr_t;
+  using iterator_concept = std::input_iterator_tag;
+
+  constexpr common_input_iterator() = default;
+  constexpr explicit common_input_iterator(Base it) : it_(it) {}
+
+  constexpr common_input_iterator& operator++() {
+    ++it_;
+    return *this;
+  }
+  constexpr void operator++(int) { ++it_; }
+
+  constexpr std::iter_reference_t<Base> operator*() const { return *it_; }
+
+  friend constexpr bool operator==(common_input_iterator const&, common_input_iterator const&) = default;
+};
+
+#  endif // TEST_STD_VER > 17
+
 // Iterator adaptor that counts the number of times the iterator has had a successor/predecessor
 // operation called. Has two recorders:
 // * `stride_count`, which records the total number of calls to an op++, op--, op+=, or op-=.