diff --git a/app/controllers/api/v1/donation_campaigns_controller.rb b/app/controllers/api/v1/donation_campaigns_controller.rb
index cdd7503b304..e1368e72f10 100644
--- a/app/controllers/api/v1/donation_campaigns_controller.rb
+++ b/app/controllers/api/v1/donation_campaigns_controller.rb
@@ -44,7 +44,7 @@ class Api::V1::DonationCampaignsController < Api::BaseController
     Rails.cache.write_multi(
       {
         request_key => campaign_key(campaign),
-        "donation_campaign:#{campaign_key(campaign)}" => Oj.dump(campaign),
+        "donation_campaign:#{campaign_key(campaign)}" => campaign.to_json,
       },
       expires_in: 1.hour,
       raw: true
diff --git a/spec/requests/api/v1/donation_campaigns_spec.rb b/spec/requests/api/v1/donation_campaigns_spec.rb
index 2ab3fb8e8a6..5df360b728b 100644
--- a/spec/requests/api/v1/donation_campaigns_spec.rb
+++ b/spec/requests/api/v1/donation_campaigns_spec.rb
@@ -78,7 +78,7 @@ RSpec.describe 'Donation campaigns' do
         end
 
         before do
-          stub_request(:get, "#{api_url}?platform=web&seed=#{seed}&locale=en").to_return(body: Oj.dump(campaign_json), status: 200)
+          stub_request(:get, "#{api_url}?platform=web&seed=#{seed}&locale=en").to_return(body: JSON.generate(campaign_json), status: 200)
         end
 
         it 'returns the expected campaign' do