diff --git a/setup.py b/setup.py
index a013942600..50d1916431 100755
--- a/setup.py
+++ b/setup.py
@@ -51,7 +51,8 @@ for dep in info.get('depends', []):
         requires.append(get_require_version('trytond_%s' % dep))
 requires.append(get_require_version('trytond'))
 
-tests_require = [get_require_version('proteus')]
+tests_require = [get_require_version('proteus'),
+    get_require_version('trytond_sale')]
 dependency_links = []
 if minor_version % 2:
     dependency_links.append('https://trydevpi.tryton.org/')
diff --git a/tests/test_commission.py b/tests/test_commission.py
index 460354a237..e44e6f3368 100644
--- a/tests/test_commission.py
+++ b/tests/test_commission.py
@@ -53,6 +53,7 @@ def create_plan(lines):
 class CommissionTestCase(ModuleTestCase):
     'Test Commission module'
     module = 'commission'
+    extras = ['sale']
 
     @with_transaction()
     def test_plan_category(self):