diff --git a/libstdc++-v3/include/bits/hashtable_policy.h b/libstdc++-v3/include/bits/hashtable_policy.h
index 1090a398e1e0788232238a0b76175526210dbfc6..2130c958262a2f23b7b3d3ae75afc605040e5387 100644
--- a/libstdc++-v3/include/bits/hashtable_policy.h
+++ b/libstdc++-v3/include/bits/hashtable_policy.h
@@ -1162,7 +1162,7 @@ namespace __detail
     struct _Hashtable_ebo_helper<_Nm, _Tp, true>
     : private _Tp
     {
-      _Hashtable_ebo_helper() = default;
+      _Hashtable_ebo_helper() noexcept(noexcept(_Tp())) : _Tp() { }
 
       template<typename _OtherTp>
 	_Hashtable_ebo_helper(_OtherTp&& __tp)
@@ -1188,7 +1188,7 @@ namespace __detail
       _Tp& _M_get() { return _M_tp; }
 
     private:
-      _Tp _M_tp;
+      _Tp _M_tp{};
     };
 
   /**
@@ -1246,6 +1246,7 @@ namespace __detail
       // We need the default constructor for the local iterators and _Hashtable
       // default constructor.
       _Hash_code_base() = default;
+
       _Hash_code_base(const _Hash& __hash) : __ebo_hash(__hash) { }
 
       __hash_code
@@ -1639,6 +1640,7 @@ namespace __detail
 
     protected:
       _Hashtable_base() = default;
+
       _Hashtable_base(const _Hash& __hash, const _Equal& __eq)
       : __hash_code_base(__hash), _EqualEBO(__eq)
       { }
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc b/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc
index bbfd683d433042e0143df4e8c280f7142c7bc8d3..12f1163951eddde28b0f578c99a192557895d476 100644
--- a/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc
+++ b/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc
@@ -17,7 +17,6 @@
 
 // { dg-do run { target c++11 } }
 // { dg-options "-O0" }
-// { dg-xfail-run-if "PR c++/65816" { *-*-* } }
 
 #include <unordered_map>
 #include <testsuite_hooks.h>
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc b/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc
index 6ee32d45cebeb14d1f1e4db060912125f71069b7..1ea6603024e136add5c4daa644d9b1fee23b1661 100644
--- a/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc
+++ b/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc
@@ -17,7 +17,6 @@
 
 // { dg-do run { target c++11 } }
 // { dg-options "-O0" }
-// { dg-xfail-run-if "PR c++/65816" { *-*-* } }
 
 #include <unordered_set>
 #include <testsuite_hooks.h>