diff --git a/lib/libcxx/include/__flat_map/flat_map.h b/lib/libcxx/include/__flat_map/flat_map.h
index a0594ed9dc411d60e12f7bf33fd74281017baeac..9cc39c0a1e06765b3a7e38a2a9564dde9987b850 100644
--- a/lib/libcxx/include/__flat_map/flat_map.h
+++ b/lib/libcxx/include/__flat_map/flat_map.h
@@ -113,7 +113,7 @@ public:
 
   class value_compare {
   private:
-    key_compare __comp_;
+    _LIBCPP_NO_UNIQUE_ADDRESS key_compare __comp_;
     _LIBCPP_HIDE_FROM_ABI value_compare(key_compare __c) : __comp_(__c) {}
     friend flat_map;
 
diff --git a/lib/libcxx/include/__flat_map/flat_multimap.h b/lib/libcxx/include/__flat_map/flat_multimap.h
index ea77fb5d79bd2951d5a1e793a0d7b497dde309da..15fcd7995ad0a8902ef8ae65e38f516a61fef3cc 100644
--- a/lib/libcxx/include/__flat_map/flat_multimap.h
+++ b/lib/libcxx/include/__flat_map/flat_multimap.h
@@ -115,7 +115,7 @@ public:
 
   class value_compare {
   private:
-    key_compare __comp_;
+    _LIBCPP_NO_UNIQUE_ADDRESS key_compare __comp_;
     _LIBCPP_HIDE_FROM_ABI value_compare(key_compare __c) : __comp_(__c) {}
     friend flat_multimap;