1 files changed, 5 insertions, 4 deletions
diff --git a/lib/gitlab/database/migration.rb b/lib/gitlab/database/migration.rb
index dc695a74a4b..038af570dbc 100644
--- a/lib/gitlab/database/migration.rb
+++ b/lib/gitlab/database/migration.rb
@@ -37,18 +37,19 @@ module Gitlab
       class V1_0 < ActiveRecord::Migration[6.1] # rubocop:disable Naming/ClassAndModuleCamelCase
         include LockRetriesConcern
         include Gitlab::Database::MigrationHelpers::V2
-      end
-
-      class V2_0 < V1_0 # rubocop:disable Naming/ClassAndModuleCamelCase
-        include Gitlab::Database::MigrationHelpers::RestrictGitlabSchema
 
         # When running migrations, the `db:migrate` switches connection of
         # ActiveRecord::Base depending where the migration runs.
         # This helper class is provided to avoid confusion using `ActiveRecord::Base`
         class MigrationRecord < ActiveRecord::Base
+          self.abstract_class = true # Prevent STI behavior
         end
       end
 
+      class V2_0 < V1_0 # rubocop:disable Naming/ClassAndModuleCamelCase
+        include Gitlab::Database::MigrationHelpers::RestrictGitlabSchema
+      end
+
       def self.[](version)
         version = version.to_s
         name = "V#{version.tr('.', '_')}"