diff --git a/changelogs/unreleased/blackst0ne-rails5-expected-search-search-seed_project-got-nil.yml b/changelogs/unreleased/blackst0ne-rails5-expected-search-search-seed_project-got-nil.yml
new file mode 100644
index 00000000000..e7bb2703b03
--- /dev/null
+++ b/changelogs/unreleased/blackst0ne-rails5-expected-search-search-seed_project-got-nil.yml
@@ -0,0 +1,5 @@
+---
+title: "[Rails5] Fix sessions_controller_spec"
+merge_request: 19936
+author: "@blackst0ne"
+type: fixed
diff --git a/spec/controllers/sessions_controller_spec.rb b/spec/controllers/sessions_controller_spec.rb
index 555b186fe31..2b61e0d4a85 100644
--- a/spec/controllers/sessions_controller_spec.rb
+++ b/spec/controllers/sessions_controller_spec.rb
@@ -257,15 +257,15 @@ describe SessionsController do
     end
   end
 
-  describe '#new' do
+  describe "#new" do
     before do
       set_devise_mapping(context: @request)
     end
 
-    it 'redirects correctly for referer on same host with params' do
-      search_path = '/search?search=seed_project'
-      allow(controller.request).to receive(:referer)
-        .and_return('http://%{host}%{path}' % { host: 'test.host', path: search_path })
+    it "redirects correctly for referer on same host with params" do
+      host = "test.host"
+      search_path = "/search?search=seed_project"
+      request.headers[:HTTP_REFERER] = "http://#{host}#{search_path}"
 
       get(:new, redirect_to_referer: :yes)