diff --git a/tests/scenario_project_invoice_timesheet.rst b/tests/scenario_project_invoice_timesheet.rst
index 347f2c131a..de783cef97 100644
--- a/tests/scenario_project_invoice_timesheet.rst
+++ b/tests/scenario_project_invoice_timesheet.rst
@@ -148,8 +148,8 @@ Check project duration::
     >>> project.reload()
     >>> project.invoiced_duration
     datetime.timedelta(0)
-    >>> project.duration_to_invoice
-    datetime.timedelta(0, 18000)
+    >>> project.duration_to_invoice == datetime.timedelta(0, 18000)
+    True
     >>> project.invoiced_amount
     Decimal('0.00')