diff --git a/tests/test_engine.py b/tests/test_engine.py
index 679e5ec..e3a49dd 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -438,7 +438,7 @@ def test_reference_split_handles_semicolon():
 
 def test_clean_pdf_before_run(tmp_path, pdf_files):
     tmp_file_path = tmp_path / "packed.pdf"
-    pdf = pdf_files[7]
+    pdf = pdf_files[9]
     with open(pdf, 'rb') as input, open(tmp_file_path, 'wb') as tmp_out:
         tmp_out.write(input.read())