diff --git a/tests/functions_test/dmpd_functions.py b/tests/functions_test/dmpd_functions.py
index 686ada1..4d23f70 100755
--- a/tests/functions_test/dmpd_functions.py
+++ b/tests/functions_test/dmpd_functions.py
@@ -282,7 +282,8 @@ def thin_test(args):
                command=run,
                errors=errors)
 
-    atomic_run("Outputting reverse map of metadata device",
+    atomic_run("Outputting reverse map of metadata device with negative number in region",
+               False,
                source_vg=args["group"],
                source_lv=args["swap"],
                region="0..-1",