diff --git a/app/models/domain_block.rb b/app/models/domain_block.rb
index 2853f6457a..8e7d7b6afc 100644
--- a/app/models/domain_block.rb
+++ b/app/models/domain_block.rb
@@ -21,7 +21,7 @@ class DomainBlock < ApplicationRecord
   include DomainNormalizable
   include DomainMaterializable
 
-  enum :severity, { silence: 0, suspend: 1, noop: 2 }
+  enum :severity, { silence: 0, suspend: 1, noop: 2 }, validate: true
 
   validates :domain, presence: true, uniqueness: true, domain: true
 
diff --git a/spec/requests/api/v1/admin/domain_blocks_spec.rb b/spec/requests/api/v1/admin/domain_blocks_spec.rb
index 029de72fd7..d0a94b5d0c 100644
--- a/spec/requests/api/v1/admin/domain_blocks_spec.rb
+++ b/spec/requests/api/v1/admin/domain_blocks_spec.rb
@@ -217,6 +217,17 @@ RSpec.describe 'Domain Blocks' do
           .to start_with('application/json')
       end
     end
+
+    context 'when severity is invalid' do
+      let(:params) { { domain: 'bar.com', severity: :bar } }
+
+      it 'returns http unprocessable entity' 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')
+      end
+    end
   end
 
   describe 'PUT /api/v1/admin/domain_blocks/:id' do