diff --git a/include/boost/system/result.hpp b/include/boost/system/result.hpp
index 86fd638..0d5a866 100644
--- a/include/boost/system/result.hpp
+++ b/include/boost/system/result.hpp
@@ -1067,6 +1067,23 @@ U operator|( result<void, E>&& r, F&& f )
     }
 }
 
+// operator|=
+
+// result |= value
+
+template<class T, class E, class U,
+    class En = typename std::enable_if<detail::is_value_convertible_to<U, T>::value>::type
+>
+result<T, E>& operator|=( result<T, E>& r, U&& u )
+{
+    if( !r )
+    {
+        r = std::forward<U>( u );
+    }
+
+    return r;
+}
+
 // operator&
 
 // result & unary-returning-value
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index ecac1a4..0bb84a4 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -174,3 +174,4 @@ boost_test(TYPE run SOURCES result_and_fn1r.cpp)
 boost_test(TYPE run SOURCES result_and_eq_fn1v.cpp)
 boost_test(TYPE run SOURCES result_and_eq_fn1r.cpp)
 boost_test(TYPE run SOURCES result_in_place_use.cpp)
+boost_test(TYPE run SOURCES result_or_eq_value.cpp)
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index ea7c78e..f757779 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -204,3 +204,4 @@ run result_and_fn1r.cpp ;
 run result_and_eq_fn1v.cpp ;
 run result_and_eq_fn1r.cpp ;
 run result_in_place_use.cpp ;
+run result_or_eq_value.cpp ;
diff --git a/test/result_or_eq_value.cpp b/test/result_or_eq_value.cpp
new file mode 100644
index 0000000..ac2c751
--- /dev/null
+++ b/test/result_or_eq_value.cpp
@@ -0,0 +1,102 @@
+// Copyright 2017, 2021-2024 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/system/result.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+using namespace boost::system;
+
+struct X
+{
+    int v_;
+};
+
+struct Y
+{
+    int v_;
+
+    explicit Y( int v ): v_( v ) {}
+    Y( X x ): v_( x.v_) {}
+
+    Y( Y const& ) = delete;
+    Y& operator=( Y const& ) = delete;
+
+    Y( Y&& r ): v_( r.v_ )
+    {
+        r.v_ = 0;
+    }
+
+    Y& operator=( Y&& r )
+    {
+        if( &r != this )
+        {
+            v_ = r.v_;
+            r.v_ = 0;
+        }
+
+        return *this;
+    }
+};
+
+struct E
+{
+};
+
+int main()
+{
+    {
+        result<int> r( 1 );
+
+        r |= 2;
+
+        BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( *r, 1 );
+    }
+
+    {
+        result<int, E> r( in_place_error );
+
+        r |= 2;
+
+        BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( *r, 2 );
+    }
+
+    {
+        result<Y> r( in_place_value, 1 );
+
+        r |= X{2};
+
+        BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( r->v_, 1 );
+    }
+
+    {
+        result<Y, E> r( in_place_error );
+
+        r |= X{2};
+
+        BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( r->v_, 2 );
+    }
+
+    {
+        int x1 = 1;
+        int x2 = 2;
+
+        result<int&> r( x1 );
+
+        r |= x2;
+
+        BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( &*r, &x1 );
+    }
+
+    {
+        int x2 = 2;
+
+        result<int&, E> r( in_place_error );
+
+        r |= x2;
+
+        BOOST_TEST( r.has_value() ) && BOOST_TEST_EQ( &*r, &x2 );
+    }
+
+    return boost::report_errors();
+}