diff --git a/src/openforms/submissions/tests/test_tasks_pdf.py b/src/openforms/submissions/tests/test_tasks_pdf.py
index f277cd120e..e9b2daa641 100644
--- a/src/openforms/submissions/tests/test_tasks_pdf.py
+++ b/src/openforms/submissions/tests/test_tasks_pdf.py
@@ -136,7 +136,7 @@ def test_date_object_is_converted_to_str_when_it_comes_from_logic_rule(self):
                     "variable": "updatedDate",
                     "action": {
                         "type": "variable",
-                        "value": {"+": [{"var": "date1"}, {"duration": "P1M"}]},
+                        "value": {"+": [{"var": "date1"}, {"duration": "P15D"}]},
                     },
                 },
             ],
@@ -147,7 +147,7 @@ def test_date_object_is_converted_to_str_when_it_comes_from_logic_rule(self):
 
         html = submission.report.generate_submission_report_pdf()
 
-        self.assertIn("31 januari 2025", html)
+        self.assertIn("16 januari 2025", html)
 
     def test_visible_output_included(self):
         """