diff --git a/config/config-package.py b/config/config-package.py
index 082169e..66d75fa 100755
--- a/config/config-package.py
+++ b/config/config-package.py
@@ -474,7 +474,7 @@ def tox(self):
             docs_deps=docs_deps,
             setuptools_version_spec=SETUPTOOLS_VERSION_SPEC,
             future_python_shortversion=FUTURE_PYTHON_SHORTVERSION,
-            supported_python_versions=supported_python_versions(True),
+            supported_python_versions=supported_python_versions(short_version=True),
         )
 
     def tests_yml(self):