lupdate cannot resolve context when member function implementaton is in a namespace scope

lupdate cannot resolve context when member function implementaton is in a namespace scope.
Example:

 
namespace MyNamespace {

QString MyClass::someFunc() const
{
    return tr("Test");
}

}

For this code lupdate outputs the following warning...
C:/Projects/Temporary/TempProject9/main.cpp:13: Qualifying with unknown namespace/class ::MyClass

...and produces wrong .tr file:

<context>
    <name>MyClass</name>
    <message>
        <location filename="main.cpp" line="13"/>
        <source>Test</source>
        <translation type="unfinished"></translation>
    </message>
</context>

Where content of the element "name" is wrong, should be:
<name>MyNamespace::MyClass</name>