diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index cbe1da6d125..71e1de078b5 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -846,6 +846,28 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	return __atomic_exchange_n(&_M_p, __p, int(__m));
       }
 
+      _GLIBCXX_ALWAYS_INLINE bool
+      compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
+			    memory_order __m1,
+			    memory_order __m2) noexcept
+      {
+	__glibcxx_assert(__is_valid_cmpexch_failure_order(__m2));
+
+	return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 1,
+					   int(__m1), int(__m2));
+      }
+
+      _GLIBCXX_ALWAYS_INLINE bool
+      compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
+			    memory_order __m1,
+			    memory_order __m2) volatile noexcept
+      {
+	__glibcxx_assert(__is_valid_cmpexch_failure_order(__m2));
+
+	return __atomic_compare_exchange_n(&_M_p, &__p1, __p2, 1,
+					   int(__m1), int(__m2));
+      }
+
       _GLIBCXX_ALWAYS_INLINE bool
       compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
 			      memory_order __m1,
diff --git a/libstdc++-v3/include/std/atomic b/libstdc++-v3/include/std/atomic
index bdbbfd5c8f8..936dd50ba1c 100644
--- a/libstdc++-v3/include/std/atomic
+++ b/libstdc++-v3/include/std/atomic
@@ -595,13 +595,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       bool
       compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
 			    memory_order __m1, memory_order __m2) noexcept
-      { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
+      { return _M_b.compare_exchange_weak(__p1, __p2, __m1, __m2); }
 
       bool
       compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
 			    memory_order __m1,
 			    memory_order __m2) volatile noexcept
-      { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
+      { return _M_b.compare_exchange_weak(__p1, __p2, __m1, __m2); }
 
       bool
       compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,