diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index 94789702d65..87657e4e3d2 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -71,7 +71,7 @@ class ProjectsController < ApplicationController
   def remove_fork
     return access_denied! unless can?(current_user, :remove_fork_project, @project)
 
-    if @project.unlink_fork(current_user)
+    if ::Projects::UnlinkForkService.new(@project, current_user).execute
       flash[:notice] = 'The fork relationship has been removed.'
     end
   end
diff --git a/app/models/project.rb b/app/models/project.rb
index 8d9908128e2..691b706ea40 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -917,26 +917,6 @@ class Project < ActiveRecord::Base
     self.builds_enabled = true
   end
 
-  def unlink_fork(user)
-    if forked?
-      forked_from_project.lfs_objects.find_each do |lfs_object|
-        lfs_object.projects << self
-      end
-
-      merge_requests = forked_from_project.merge_requests.opened.from_project(self)
-
-      unless merge_requests.empty?
-        close_service = MergeRequests::CloseService.new(self, user)
-
-        merge_requests.each do |mr|
-          close_service.execute(mr)
-        end
-      end
-
-      forked_project_link.destroy
-    end
-  end
-
   def any_runners?(&block)
     if runners.active.any?(&block)
       return true
diff --git a/app/services/projects/unlink_fork_service.rb b/app/services/projects/unlink_fork_service.rb
new file mode 100644
index 00000000000..d0703effa1d
--- /dev/null
+++ b/app/services/projects/unlink_fork_service.rb
@@ -0,0 +1,19 @@
+module Projects
+  class UnlinkForkService < BaseService
+    def execute
+      return unless @project.forked?
+
+      @project.forked_from_project.lfs_objects.find_each do |lfs_object|
+        lfs_object.projects << self
+      end
+
+      merge_requests = @project.forked_from_project.merge_requests.opened.from_project(@project)
+
+      merge_requests.each do |mr|
+        MergeRequests::CloseService.new(@project, @current_user).execute(mr)
+      end
+
+      @project.forked_project_link.destroy
+    end
+  end
+end
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index 1ca78daa5b3..59c5ffa6b9c 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -699,25 +699,6 @@ describe Project, models: true do
     end
   end
 
-  describe '#unlink_fork' do
-    let(:fork_link) { create(:forked_project_link) }
-    let(:fork_project) { fork_link.forked_to_project }
-    let(:user) { create(:user) }
-    let(:merge_request) { create(:merge_request, source_project: fork_project, target_project: fork_link.forked_from_project) }
-    let!(:close_service) { MergeRequests::CloseService.new(fork_project, user) }
-
-    it 'remove fork relation and close all pending merge requests' do
-      allow(MergeRequests::CloseService).to receive(:new).
-        with(fork_project, user).
-        and_return(close_service)
-
-      expect(close_service).to receive(:execute).with(merge_request)
-      expect(fork_project.forked_project_link).to receive(:destroy)
-
-      fork_project.unlink_fork(user)
-    end
-  end
-
   describe '.search_by_title' do
     let(:project) { create(:project, name: 'kittens') }
 
diff --git a/spec/services/projects/unlink_fork_service_spec.rb b/spec/services/projects/unlink_fork_service_spec.rb
new file mode 100644
index 00000000000..f287b0a59b2
--- /dev/null
+++ b/spec/services/projects/unlink_fork_service_spec.rb
@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe Projects::UnlinkForkService, services: true do
+  subject { Projects::UnlinkForkService.new(fork_project, user) }
+
+  let(:fork_link) { create(:forked_project_link) }
+  let(:fork_project) { fork_link.forked_to_project }
+  let(:user) { create(:user) }
+
+  context 'with opened merge request on the source project' do
+    let(:merge_request) { create(:merge_request, source_project: fork_project, target_project: fork_link.forked_from_project) }
+    let(:mr_close_service) { MergeRequests::CloseService.new(fork_project, user) }
+
+    before do
+      allow(MergeRequests::CloseService).to receive(:new).
+        with(fork_project, user).
+        and_return(mr_close_service)
+    end
+
+    it 'close all pending merge requests' do
+      expect(mr_close_service).to receive(:execute).with(merge_request)
+
+      subject.execute
+    end
+  end
+
+  it 'remove fork relation' do
+      expect(fork_project.forked_project_link).to receive(:destroy)
+
+      subject.execute
+  end
+end