diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 1648d46..e964b5a 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -62,3 +62,5 @@ system-run failed_constexpr_test.cpp ;
 run quick.cpp ;
 
 run warnings_test.cpp : : : <warnings>all <warnings-as-errors>on <toolset>gcc:<cxxflags>-Wnon-virtual-dtor <toolset>clang:<cxxflags>-Wnon-virtual-dtor ;
+
+system-run std_ec_mismatch_test.cpp std_ec_mismatch_1.cpp std_ec_mismatch_2.cpp ;
diff --git a/test/std_ec_mismatch_1.cpp b/test/std_ec_mismatch_1.cpp
new file mode 100644
index 0000000..a4503ec
--- /dev/null
+++ b/test/std_ec_mismatch_1.cpp
@@ -0,0 +1,26 @@
+
+// Copyright 2019 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+
+#include <boost/system/error_code.hpp>
+
+#if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
+
+#include <system_error>
+
+namespace lib1
+{
+
+std::error_code get_system_code()
+{
+    return boost::system::error_code( 0, boost::system::system_category() );
+}
+
+std::error_code get_generic_code()
+{
+    return boost::system::error_code( 0, boost::system::generic_category() );
+}
+
+} // namespace lib1
+
+#endif
diff --git a/test/std_ec_mismatch_2.cpp b/test/std_ec_mismatch_2.cpp
new file mode 100644
index 0000000..1904f62
--- /dev/null
+++ b/test/std_ec_mismatch_2.cpp
@@ -0,0 +1,26 @@
+
+// Copyright 2019 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+
+#include <boost/system/error_code.hpp>
+
+#if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
+
+#include <system_error>
+
+namespace lib2
+{
+
+std::error_code get_system_code()
+{
+    return boost::system::error_code( 0, boost::system::system_category() );
+}
+
+std::error_code get_generic_code()
+{
+    return boost::system::error_code( 0, boost::system::generic_category() );
+}
+
+} // namespace lib2
+
+#endif
diff --git a/test/std_ec_mismatch_test.cpp b/test/std_ec_mismatch_test.cpp
new file mode 100644
index 0000000..19da8da
--- /dev/null
+++ b/test/std_ec_mismatch_test.cpp
@@ -0,0 +1,56 @@
+
+// Copyright 2019 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+
+#include <boost/system/error_code.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if !defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
+
+BOOST_PRAGMA_MESSAGE( "BOOST_SYSTEM_HAS_SYSTEM_ERROR not defined, test will be skipped" )
+
+int main() {}
+
+#else
+
+#include <boost/core/lightweight_test.hpp>
+#include <system_error>
+
+using namespace boost::system;
+
+namespace lib1
+{
+
+std::error_code get_system_code();
+std::error_code get_generic_code();
+
+} // namespace lib1
+
+namespace lib2
+{
+
+std::error_code get_system_code();
+std::error_code get_generic_code();
+
+} // namespace lib2
+
+int main()
+{
+    {
+        std::error_code e1 = lib1::get_system_code();
+        std::error_code e2 = lib2::get_system_code();
+
+        BOOST_TEST_EQ( e1, e2 );
+    }
+
+    {
+        std::error_code e1 = lib1::get_generic_code();
+        std::error_code e2 = lib2::get_generic_code();
+
+        BOOST_TEST_EQ( e1, e2 );
+    }
+
+    return boost::report_errors();
+}
+
+#endif