diff --git a/tests/strings/strings.cpp b/tests/strings/strings.cpp
index fa633e6861..d8dc4fa3c2 100644
--- a/tests/strings/strings.cpp
+++ b/tests/strings/strings.cpp
@@ -323,4 +323,17 @@ void StringTestCase::CaseChanges()
     CPPUNIT_ASSERT( s1l == _T("hello!") );
     CPPUNIT_ASSERT( s2u == wxEmptyString );
     CPPUNIT_ASSERT( s2l == wxEmptyString );
+
+#if !wxUSE_UNICODE
+    wxLocale locRu(wxLANGUAGE_RUSSIAN, 0 /* flags */);
+    if ( locRu.IsOk() )
+    {
+        // try upper casing 8bit strings
+        wxString sUpper("\xdf"),
+                 sLower("\xff");
+
+        CPPUNIT_ASSERT( sUpper.Lower() == sLower );
+        CPPUNIT_ASSERT( sLower.Upper() == sUpper );
+    }
+#endif // !wxUSE_UNICODE
 }