diff --git a/product/ERP5/tests/testProductionOrder.py b/product/ERP5/tests/testProductionOrder.py
index 8e800c127a9302dd10e311a92f2efb0f88c76da6..e4797fc99d57dfcc70c98912a0e7f9d84578ba5b 100644
--- a/product/ERP5/tests/testProductionOrder.py
+++ b/product/ERP5/tests/testProductionOrder.py
@@ -97,9 +97,8 @@ class TestProductionOrderMixin(TestOrderMixin):
       some categories for testing them
     """
     TestOrderMixin.createCategories(self)
-    operation_category_list = ['operation1', 'operation2']
     if len(self.category_tool.operation.contentValues()) == 0:
-      for category_id in operation_category_list:
+      for category_id in self.operation_category_list:
         o = self.category_tool.operation.newContent(
                                                portal_type='Category',
                                                id=category_id)