diff --git a/app/controllers/concerns/milestone_actions.rb b/app/controllers/concerns/milestone_actions.rb
index c28d08201e0..2cc7e15c27d 100644
--- a/app/controllers/concerns/milestone_actions.rb
+++ b/app/controllers/concerns/milestone_actions.rb
@@ -3,6 +3,7 @@ module MilestoneActions
 
   def merge_requests
     respond_to do |format|
+      format.html { redirect_to milestone_path }
       format.json do
         render json: tabs_json("shared/milestones/_merge_requests_tab", {
           merge_requests: @milestone.merge_requests,
@@ -14,6 +15,7 @@ module MilestoneActions
 
   def participants
     respond_to do |format|
+      format.html { redirect_to milestone_path }
       format.json do
         render json: tabs_json("shared/milestones/_participants_tab", {
           users: @milestone.participants
@@ -24,6 +26,7 @@ module MilestoneActions
 
   def labels
     respond_to do |format|
+      format.html { redirect_to milestone_path }
       format.json do
         render json: tabs_json("shared/milestones/_labels_tab", {
           labels: @milestone.labels
@@ -39,4 +42,12 @@ module MilestoneActions
       html: view_to_html_string(partial, data)
     }
   end
+
+  def milestone_path
+    if @project
+      namespace_project_milestone_path(@project.namespace, @project, @milestone)
+    else
+      group_milestone_path(@group, @milestone.safe_title, title: @milestone.title)
+    end
+  end
 end
diff --git a/spec/controllers/groups/milestones_controller_spec.rb b/spec/controllers/groups/milestones_controller_spec.rb
index 6e4b5f78e33..7cf2996ffd0 100644
--- a/spec/controllers/groups/milestones_controller_spec.rb
+++ b/spec/controllers/groups/milestones_controller_spec.rb
@@ -6,6 +6,16 @@ describe Groups::MilestonesController do
   let(:project2) { create(:empty_project, group: group) }
   let(:user)    { create(:user) }
   let(:title) { '肯定不是中文的问题' }
+  let(:milestone) do
+    project_milestone = create(:milestone, project: project)
+
+    GroupMilestone.build(
+      group,
+      [project],
+      project_milestone.title
+    )
+  end
+  let(:milestone_path) { group_milestone_path(group, milestone.safe_title, title: milestone.title) }
 
   before do
     sign_in(user)
@@ -14,6 +24,8 @@ describe Groups::MilestonesController do
     controller.instance_variable_set(:@group, group)
   end
 
+  it_behaves_like 'milestone tabs'
+
   describe "#create" do
     it "creates group milestone with Chinese title" do
       post :create,
diff --git a/spec/controllers/projects/milestones_controller_spec.rb b/spec/controllers/projects/milestones_controller_spec.rb
index 47e61c3cea8..6f500468f95 100644
--- a/spec/controllers/projects/milestones_controller_spec.rb
+++ b/spec/controllers/projects/milestones_controller_spec.rb
@@ -7,6 +7,7 @@ describe Projects::MilestonesController do
   let(:issue) { create(:issue, project: project, milestone: milestone) }
   let!(:label) { create(:label, project: project, title: 'Issue Label', issues: [issue]) }
   let!(:merge_request) { create(:merge_request, source_project: project, target_project: project, milestone: milestone) }
+  let(:milestone_path) { namespace_project_milestone_path }
 
   before do
     sign_in(user)
@@ -14,6 +15,8 @@ describe Projects::MilestonesController do
     controller.instance_variable_set(:@project, project)
   end
 
+  it_behaves_like 'milestone tabs'
+
   describe "#show" do
     render_views
 
@@ -49,4 +52,6 @@ describe Projects::MilestonesController do
       expect(last_note).to eq('removed milestone')
     end
   end
+
+
 end
diff --git a/spec/support/milestone_tabs_examples.rb b/spec/support/milestone_tabs_examples.rb
new file mode 100644
index 00000000000..c48ecb1672e
--- /dev/null
+++ b/spec/support/milestone_tabs_examples.rb
@@ -0,0 +1,67 @@
+shared_examples 'milestone tabs' do
+  def go(path, extra_params = {})
+    params = if milestone.is_a?(GlobalMilestone)
+               { group_id: group.id, id: milestone.safe_title, title: milestone.title }
+             else
+               { namespace_id: project.namespace.to_param, project_id: project, id: milestone.iid }
+             end
+
+    get path, params.merge(extra_params)
+  end
+  describe '#merge_requests' do
+    context 'as html' do
+      before { go(:merge_requests, format: 'html') }
+
+      it 'redirects to milestone#show' do
+        expect(response).to redirect_to(milestone_path)
+      end
+    end
+
+    context 'as json' do
+      before { go(:merge_requests, format: 'json') }
+
+      it 'renders the merge requests tab template to a string' do
+        expect(response).to render_template('shared/milestones/_merge_requests_tab')
+        expect(json_response).to have_key('html')
+      end
+    end
+  end
+
+  describe '#participants' do
+    context 'as html' do
+      before { go(:participants, format: 'html') }
+
+      it 'redirects to milestone#show' do
+        expect(response).to redirect_to(milestone_path)
+      end
+    end
+
+    context 'as json' do
+      before { go(:participants, format: 'json') }
+
+      it 'renders the participants tab template to a string' do
+        expect(response).to render_template('shared/milestones/_participants_tab')
+        expect(json_response).to have_key('html')
+      end
+    end
+  end
+
+  describe '#labels' do
+    context 'as html' do
+      before { go(:labels, format: 'html') }
+
+      it 'redirects to milestone#show' do
+        expect(response).to redirect_to(milestone_path)
+      end
+    end
+
+    context 'as json' do
+      before { go(:labels, format: 'json') }
+
+      it 'renders the labels tab template to a string' do
+        expect(response).to render_template('shared/milestones/_labels_tab')
+        expect(json_response).to have_key('html')
+      end
+    end
+  end
+end