diff --git a/src/testdir/test86.in b/src/testdir/test86.in
index 6929f67..a50480c 100644
--- a/src/testdir/test86.in
+++ b/src/testdir/test86.in
@@ -867,6 +867,7 @@
     return subexpr_test(expr, 'ConvertFromPyObject', (
         'None',                 # Not conversible
         '{"": 1}',              # Empty key not allowed
+        '{u"": 1}',             # Same, but with unicode object
         'FailingMapping()',     #
         'FailingMappingKey()',  #
     ))