diff --git a/spec/requests/api/v1/admin/domain_blocks_spec.rb b/spec/requests/api/v1/admin/domain_blocks_spec.rb
index d0a94b5d0c..0b01d04f9a 100644
--- a/spec/requests/api/v1/admin/domain_blocks_spec.rb
+++ b/spec/requests/api/v1/admin/domain_blocks_spec.rb
@@ -225,7 +225,9 @@ RSpec.describe 'Domain Blocks' do
         subject
 
         expect(response).to have_http_status(422)
-        expect(body_as_json[:error]).to eq('Validation failed: Severity is not included in the list')
+        expect(response.content_type)
+          .to start_with('application/json')
+        expect(response.parsed_body[:error]).to eq('Validation failed: Severity is not included in the list')
       end
     end
   end