diff --git a/libcxx/include/forward_list b/libcxx/include/forward_list
--- a/libcxx/include/forward_list
+++ b/libcxx/include/forward_list
@@ -1587,7 +1587,7 @@
 void
 forward_list<_Tp, _Alloc>::merge(forward_list& __x, _Compare __comp)
 {
-    if (this != &__x)
+    if (this != _VSTD::addressof(__x))
     {
         base::__before_begin()->__next_ = __merge(base::__before_begin()->__next_,
                                                     __x.__before_begin()->__next_,
diff --git a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.addressof.compile.pass.cpp b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.addressof.compile.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.addressof.compile.pass.cpp
@@ -0,0 +1,24 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <forward_list>
+
+// template <class Compare> void merge(forward_list& x);
+
+// Validate whether the operation properly guards against ADL-hijacking operator&
+
+#include <forward_list>
+
+#include "test_macros.h"
+#include "operator_hijacker.h"
+
+void test() {
+  std::forward_list<operator_hijacker> lo;
+  std::forward_list<operator_hijacker> l;
+  lo.merge(l);
+}
diff --git a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.addressof.compile.pass.cpp b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.addressof.compile.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.addressof.compile.pass.cpp
@@ -0,0 +1,24 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <forward_list>
+
+// template <class Compare> void merge(forward_list& x, Compare comp);
+
+// Validate whether the operation properly guards against ADL-hijacking operator&
+
+#include <forward_list>
+
+#include "test_macros.h"
+#include "operator_hijacker.h"
+
+void test() {
+  std::forward_list<operator_hijacker> lo;
+  std::forward_list<operator_hijacker> l;
+  lo.merge(l, std::less<operator_hijacker>());
+}
diff --git a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.addressof.compile.pass.cpp b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.addressof.compile.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.addressof.compile.pass.cpp
@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03
+
+// <forward_list>
+
+// template <class Compare> void merge(forward_list&& x);
+
+// Validate whether the operation properly guards against ADL-hijacking operator&
+
+#include <forward_list>
+
+#include "test_macros.h"
+#include "operator_hijacker.h"
+
+void test() {
+  std::forward_list<operator_hijacker> lo;
+  std::forward_list<operator_hijacker> l;
+  lo.merge(std::move(l));
+}
diff --git a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.addressof.compile.pass.cpp b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.addressof.compile.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.addressof.compile.pass.cpp
@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03
+
+// <forward_list>
+
+// template <class Compare> void merge(forward_list&& x, Compare comp);
+
+// Validate whether the operation properly guards against ADL-hijacking operator&
+
+#include <forward_list>
+
+#include "test_macros.h"
+#include "operator_hijacker.h"
+
+void test() {
+  std::forward_list<operator_hijacker> lo;
+  std::forward_list<operator_hijacker> l;
+  lo.merge(std::move(l), std::less<operator_hijacker>());
+}