diff --git a/roles/ipaserver/library/ipaserver_test.py b/roles/ipaserver/library/ipaserver_test.py
index 92e703cd..7498990f 100644
--- a/roles/ipaserver/library/ipaserver_test.py
+++ b/roles/ipaserver/library/ipaserver_test.py
@@ -211,6 +211,7 @@ options:
   random_serial_numbers:
     description: The installer random_serial_numbers setting
     type: bool
+    default: no
     required: no
   allow_zone_overlap:
     description: Create DNS zone even if it already exists