diff --git a/concert/tests/unit/test_walker.py b/concert/tests/unit/test_walker.py
index a6a06cce6..4a15ef4bd 100644
--- a/concert/tests/unit/test_walker.py
+++ b/concert/tests/unit/test_walker.py
@@ -91,3 +91,4 @@ def test_ok(dsetname):
         test_raises('bar-{')
         test_raises('bar-}')
         test_raises('bar-}{')
+        test_raises('bar-}{{}')