diff --git a/HowtoGitlab/8.13.md b/HowtoGitlab/8.13.md
index 5b8815ab..f42ebead 100644
--- a/HowtoGitlab/8.13.md
+++ b/HowtoGitlab/8.13.md
@@ -413,7 +413,7 @@ $ cd gitlab
 $ git fetch --all
 $ git checkout -- Gemfile.lock db/schema.rb
 $ git checkout v8.13.6 -b v8.13.6
-$ sed -i s'/app_user="git"/app_user="gitlab-demo00"/' \
+$ sed -i -e s'/app_user="git"/app_user="gitlab-demo00"/' \
   -e 's/# Provides: .*gitlab/# Provides: gitlab-demo00/' \
   lib/support/init.d/gitlab
 $ sed -i 's#script_path = "/etc/init.d/gitlab"#script_path = "/etc/init.d/gitlab-demo00"#g' lib/tasks/gitlab/check.rake
@@ -492,7 +492,7 @@ $ bundle exec rake gitlab:backup:create RAILS_ENV=production
 $ git fetch --all
 $ git checkout -- db/schema.rb
 $ git checkout 8-14-stable
-$ sed -i s'/app_user="git"/app_user="gitlab-demo00"/' \
+$ sed -i -e s'/app_user="git"/app_user="gitlab-demo00"/' \
   -e 's/# Provides: .*gitlab/# Provides: gitlab-demo00/' \
   lib/support/init.d/gitlab
 $ sed -i 's#script_path = "/etc/init.d/gitlab"#script_path = "/etc/init.d/gitlab-demo00"#g' lib/tasks/gitlab/check.rake