diff --git a/src/main/resources/db/migration/V2__Add_side_to_arguments.sql b/src/main/resources/db/migration/V2__Add_side_to_arguments.sql
index 4c3175d..d67ef6c 100644
--- a/src/main/resources/db/migration/V2__Add_side_to_arguments.sql
+++ b/src/main/resources/db/migration/V2__Add_side_to_arguments.sql
@@ -8,4 +8,8 @@ SET side = (
       AND ud.user_id = arguments.author_id
 );
 
+UPDATE arguments
+SET side = 'PRO'
+WHERE side is null;
+
 ALTER TABLE arguments ALTER COLUMN side SET NOT NULL;