diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ad13b8c..9cdcbb8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -52,7 +52,7 @@ schleuder:
     - debconf-set-selections <<<"postfix postfix/mailname string example.org"
     - debconf-set-selections <<<"postfix postfix/main_mailer_type string 'Local only'"
     - apt update; apt install --yes schleuder schleuder-cli postfix patch
-    - patch -p1 < test/01-ruby3cgi.patch  # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1040257
+    - patch -d/ -p1 < test/01-ruby3cgi.patch  # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1040257
     - /usr/lib/postfix/configure-instance.sh -
     - echo "virtual_alias_maps = static:root" >> /etc/postfix/main.cf
     - /usr/sbin/postmulti -i - -p start