diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0ef317a6db90eb5fa5933c7e4f9c26fb50f7ab57..eef2dbde50a7d7eafc4689e1fc54212abfb2b2f2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,4 +4,4 @@ trigger_doc_rebuild_in_main_project:
     project: hub/shiny-k8s
     branch: docs
   variables:
-    SOURCE_CI_PIPELINE_ID: ${SOURCE_CI_PIPELINE_ID}
\ No newline at end of file
+    SOURCE_CI_PIPELINE_ID: "${SOURCE_CI_PIPELINE_ID}"
\ No newline at end of file