diff --git a/tests/bench.py b/tests/bench.py
index 7574d9218..bf2eca580 100644
--- a/tests/bench.py
+++ b/tests/bench.py
@@ -86,7 +86,7 @@ def merge():
     writer.append(reader)
 
     # PdfReader object:
-    writer.append(PdfReader(pdf_path, "rb"), outline_item="outline_top")
+    writer.append(PdfReader(pdf_path, "rb"), outline_item="True")
 
     # File handle
     with open(pdf_path, "rb") as fh: