diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1cddfaf..e14b399 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -69,7 +69,7 @@ build:x86:deb:
     ref: master
     artifacts: true
   variables:
-    SIGNALDCTL_PUBLIC_DOC_MODE: on
+    SIGNALDCTL_PUBLIC_DOC_MODE: "on"
   artifacts:
     paths:
       - "*.deb"