diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 758b560..ec0b635 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -112,6 +112,8 @@ boost_test(TYPE run SOURCES system_error_test3.cpp)
 
 boost_test(TYPE run SOURCES std_interop_test11.cpp)
 
+boost_test(TYPE run SOURCES ec_wstream_test.cpp)
+
 # result
 
 set(BOOST_TEST_COMPILE_FEATURES cxx_std_11)
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 48a7dec..ffc34ea 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -134,6 +134,8 @@ run system_error_test3.cpp ;
 
 run std_interop_test11.cpp ;
 
+run ec_wstream_test.cpp ;
+
 # result
 
 import ../../config/checks/config : requires ;
diff --git a/test/ec_wstream_test.cpp b/test/ec_wstream_test.cpp
new file mode 100644
index 0000000..1c68a4a
--- /dev/null
+++ b/test/ec_wstream_test.cpp
@@ -0,0 +1,21 @@
+// Copyright 2022 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/system/error_code.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+namespace sys = boost::system;
+
+int main()
+{
+    {
+        std::wostringstream os;
+        os << sys::error_code();
+
+        BOOST_TEST( os.str() == L"system:0" );
+    }
+
+    return boost::report_errors();
+}