diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index a2624031b..673c77316 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -30,7 +30,7 @@ class ProjectsController < ApplicationController
   before_action :authorize_global, :only => [:new, :create]
   before_action :require_admin, :only => [:copy, :archive, :unarchive]
   accept_rss_auth :index
-  accept_api_auth :index, :show, :create, :update, :destroy
+  accept_api_auth :index, :show, :create, :update, :destroy, :archive, :unarchive
   require_sudo_mode :destroy
 
   helper :custom_fields
@@ -233,16 +233,31 @@ class ProjectsController < ApplicationController
 
   def archive
     unless @project.archive
-      flash[:error] = l(:error_can_not_archive_project)
+      error = l(:error_can_not_archive_project)
+    end
+    respond_to do |format|
+      format.html do
+        flash[:error] = error if error
+        redirect_to_referer_or admin_projects_path(:status => params[:status])
+      end
+      format.api do
+        if error
+          render_api_errors error
+        else
+          render_api_ok
+        end
+      end
     end
-    redirect_to_referer_or admin_projects_path(:status => params[:status])
   end
 
   def unarchive
     unless @project.active?
       @project.unarchive
     end
-    redirect_to_referer_or admin_projects_path(:status => params[:status])
+    respond_to do |format|
+      format.html{ redirect_to_referer_or admin_projects_path(:status => params[:status]) }
+      format.api{ render_api_ok }
+    end
   end
 
   def bookmark
diff --git a/config/routes.rb b/config/routes.rb
index dbcd8ddc7..7e5e3eee9 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -131,8 +131,8 @@ Rails.application.routes.draw do
 
     member do
       get 'settings(/:tab)', :action => 'settings', :as => 'settings'
-      post 'archive'
-      post 'unarchive'
+      match 'archive', :via => [:post, :put]
+      match 'unarchive', :via => [:post, :put]
       post 'close'
       post 'reopen'
       match 'copy', :via => [:get, :post]
diff --git a/test/integration/api_test/projects_test.rb b/test/integration/api_test/projects_test.rb
index 59b10efc3..6c81aa7bd 100644
--- a/test/integration/api_test/projects_test.rb
+++ b/test/integration/api_test/projects_test.rb
@@ -356,4 +356,21 @@ class Redmine::ApiTest::ProjectsTest < Redmine::ApiTest::Base
     assert_equal '', @response.body
     assert_nil Project.find_by_id(2)
   end
+
+  test "PUT /projects/:id/archive.xml should archive project" do
+    put '/projects/1/archive.xml', :headers => credentials('admin')
+    assert_response :no_content
+    assert_equal '', @response.body
+    assert p = Project.find(1)
+    refute p.active?
+  end
+
+  test "PUT /projects/:id/unarchive.xml should unarchive project" do
+    Project.find(1).update_column :status, Project::STATUS_ARCHIVED
+    put '/projects/1/unarchive.xml', :headers => credentials('admin')
+    assert_response :no_content
+    assert_equal '', @response.body
+    assert p = Project.find_by_id(2)
+    assert p.active?
+  end
 end