diff --git a/libcxx/include/__flat_map/flat_multimap.h b/libcxx/include/__flat_map/flat_multimap.h
index 72e3b5f21670..bd3ec81b98b7 100644
--- a/libcxx/include/__flat_map/flat_multimap.h
+++ b/libcxx/include/__flat_map/flat_multimap.h
@@ -934,15 +934,6 @@ private:
 
   containers __containers_;
   _LIBCPP_NO_UNIQUE_ADDRESS key_compare __compare_;
-
-  struct __key_equiv {
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 __key_equiv(key_compare __c) : __comp_(__c) {}
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 bool
-    operator()(const_reference __x, const_reference __y) const {
-      return !__comp_(std::get<0>(__x), std::get<0>(__y)) && !__comp_(std::get<0>(__y), std::get<0>(__x));
-    }
-    key_compare __comp_;
-  };
 };
 
 template <class _KeyContainer, class _MappedContainer, class _Compare = less<typename _KeyContainer::value_type>>
diff --git a/libcxx/include/__flat_set/flat_multiset.h b/libcxx/include/__flat_set/flat_multiset.h
index b2de63bc3038..4324645fb844 100644
--- a/libcxx/include/__flat_set/flat_multiset.h
+++ b/libcxx/include/__flat_set/flat_multiset.h
@@ -745,15 +745,6 @@ private:
 
   _KeyContainer __keys_;
   _LIBCPP_NO_UNIQUE_ADDRESS key_compare __compare_;
-
-  struct __key_equiv {
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 __key_equiv(key_compare __c) : __comp_(__c) {}
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 bool
-    operator()(const_reference __x, const_reference __y) const {
-      return !__comp_(std::get<0>(__x), std::get<0>(__y)) && !__comp_(std::get<0>(__y), std::get<0>(__x));
-    }
-    key_compare __comp_;
-  };
 };
 
 template <class _KeyContainer, class _Compare = less<typename _KeyContainer::value_type>>