diff --git a/app/models/container_repository.rb b/app/models/container_repository.rb
index ab04258ab8d..0cf781799e9 100644
--- a/app/models/container_repository.rb
+++ b/app/models/container_repository.rb
@@ -2,6 +2,7 @@ class ContainerRepository < ActiveRecord::Base
   belongs_to :project
 
   validates :name, length: { minimum: 0, allow_nil: false }
+  validates :name, uniqueness: { scope: :project_id }
 
   delegate :client, to: :registry
 
diff --git a/spec/models/container_repository_spec.rb b/spec/models/container_repository_spec.rb
index f794085fc45..503da6556c0 100644
--- a/spec/models/container_repository_spec.rb
+++ b/spec/models/container_repository_spec.rb
@@ -21,6 +21,13 @@ describe ContainerRepository do
         headers: { 'Content-Type' => 'application/json' })
   end
 
+  describe 'validations' do
+    it 'validates uniqueness of name scoped to project' do
+      expect(subject).to validate_uniqueness_of(:name)
+        .scoped_to(:project_id)
+    end
+  end
+
   describe 'associations' do
     it 'belongs to the project' do
       expect(container_repository).to belong_to(:project)