diff --git a/db/migrate/20120101000001_create_base.rb b/db/migrate/20120101000001_create_base.rb
index 32b881e93..fa26dd7c6 100644
--- a/db/migrate/20120101000001_create_base.rb
+++ b/db/migrate/20120101000001_create_base.rb
@@ -741,7 +741,7 @@ class CreateBase < ActiveRecord::Migration[4.2]
     create_table :data_privacy_tasks do |t|
       t.column :state,                :string, limit: 150, default: 'in process', null: true
       t.references :deletable,        polymorphic: true
-      t.string :preferences,          limit: 8000,                                null: true
+      t.text :preferences
       t.column :updated_by_id,        :integer,                                   null: false
       t.column :created_by_id,        :integer,                                   null: false
       t.timestamps limit: 3, null: false
diff --git a/db/migrate/20210507131905_issue_3548_data_privacy_task_preferences_to_text.rb b/db/migrate/20210507131905_issue_3548_data_privacy_task_preferences_to_text.rb
new file mode 100644
index 000000000..492197978
--- /dev/null
+++ b/db/migrate/20210507131905_issue_3548_data_privacy_task_preferences_to_text.rb
@@ -0,0 +1,12 @@
+# https://github.com/zammad/zammad/issues/3548
+class Issue3548DataPrivacyTaskPreferencesToText < ActiveRecord::Migration[5.2]
+  def up
+    return if !Setting.exists?(name: 'system_init_done')
+
+    change_table :data_privacy_tasks do |t|
+      t.change :preferences, :text
+    end
+
+    DataPrivacyTask.reset_column_information
+  end
+end