diff --git a/setup.py b/setup.py
index a40ff4a0f2..5044a6f34c 100644
--- a/setup.py
+++ b/setup.py
@@ -122,7 +122,7 @@ setup(name=name,
     test_loader='trytond.test_loader:Loader',
     tests_require=tests_require,
     use_2to3=True,
-    convert_2to3_doctest=[
+    convert_2to3_doctests=[
         'tests/scenario_sale_complaint.rst',
         ],
     )