diff --git a/lib/api/repositories.rb b/lib/api/repositories.rb
index 0178289f57f..0d0f0d4616d 100644
--- a/lib/api/repositories.rb
+++ b/lib/api/repositories.rb
@@ -99,7 +99,7 @@ module API
 
         begin
           RepositoryArchiveCacheWorker.perform_async
-          header *Gitlab::Workhorse.send_git_archive(@project, params[:ref], params[:format])
+          header *Gitlab::Workhorse.send_git_archive(user_project, params[:sha], params[:format])
         rescue
           not_found!('File')
         end
diff --git a/lib/gitlab/workhorse.rb b/lib/gitlab/workhorse.rb
index 2f3e57156b6..c3ddd4c2680 100644
--- a/lib/gitlab/workhorse.rb
+++ b/lib/gitlab/workhorse.rb
@@ -3,9 +3,9 @@ require 'json'
 
 module Gitlab
   class Workhorse
-    class << self
-      SEND_DATA_HEADER = 'Gitlab-Workhorse-Send-Data'
+    SEND_DATA_HEADER = 'Gitlab-Workhorse-Send-Data'
 
+    class << self
       def send_git_blob(repository, blob)
         params = {
           'RepoPath' => repository.path_to_repo,
diff --git a/spec/requests/api/repositories_spec.rb b/spec/requests/api/repositories_spec.rb
index 4911cdd9da6..0ae63b0afec 100644
--- a/spec/requests/api/repositories_spec.rb
+++ b/spec/requests/api/repositories_spec.rb
@@ -4,6 +4,7 @@ require 'mime/types'
 describe API::API, api: true  do
   include ApiHelpers
   include RepoHelpers
+  include WorkhorseHelpers
 
   let(:user) { create(:user) }
   let(:user2) { create(:user) }
@@ -91,21 +92,27 @@ describe API::API, api: true  do
       get api("/projects/#{project.id}/repository/archive", user)
       repo_name = project.repository.name.gsub("\.git", "")
       expect(response.status).to eq(200)
-      expect(json_response['ArchivePath']).to match(/#{repo_name}\-[^\.]+\.tar.gz/)
+      type, params = workhorse_send_data
+      expect(type).to eq('git-archive')
+      expect(params['ArchivePath']).to match(/#{repo_name}\-[^\.]+\.tar.gz/)
     end
 
     it "should get the archive.zip" do
       get api("/projects/#{project.id}/repository/archive.zip", user)
       repo_name = project.repository.name.gsub("\.git", "")
       expect(response.status).to eq(200)
-      expect(json_response['ArchivePath']).to match(/#{repo_name}\-[^\.]+\.zip/)
+      type, params = workhorse_send_data
+      expect(type).to eq('git-archive')
+      expect(params['ArchivePath']).to match(/#{repo_name}\-[^\.]+\.zip/)
     end
 
     it "should get the archive.tar.bz2" do
       get api("/projects/#{project.id}/repository/archive.tar.bz2", user)
       repo_name = project.repository.name.gsub("\.git", "")
       expect(response.status).to eq(200)
-      expect(json_response['ArchivePath']).to match(/#{repo_name}\-[^\.]+\.tar.bz2/)
+      type, params = workhorse_send_data
+      expect(type).to eq('git-archive')
+      expect(params['ArchivePath']).to match(/#{repo_name}\-[^\.]+\.tar.bz2/)
     end
 
     it "should return 404 for invalid sha" do
diff --git a/spec/support/workhorse_helpers.rb b/spec/support/workhorse_helpers.rb
new file mode 100644
index 00000000000..c5c5d4c63d1
--- /dev/null
+++ b/spec/support/workhorse_helpers.rb
@@ -0,0 +1,16 @@
+module WorkhorseHelpers
+  extend self
+
+  def workhorse_send_data
+    @_workhorse_send_data ||= begin
+      header = response.headers[Gitlab::Workhorse::SEND_DATA_HEADER]
+      split_header = header.split(':')
+      type = split_header.shift
+      header = split_header.join(':')
+      [
+        type,
+        JSON.parse(Base64.urlsafe_decode64(header)),
+      ]
+    end
+  end
+end
\ No newline at end of file