diff --git a/doc/ci/triggers/index.md b/doc/ci/triggers/index.md
index a47eaaf0381fec58a466812a238be0a84e3d4189..3970db8fe53347e5ca1b4947071e439aab2badfc 100644
--- a/doc/ci/triggers/index.md
+++ b/doc/ci/triggers/index.md
@@ -140,7 +140,7 @@ The parameter is of the form `variables[key]=value`, for example:
 curl --request POST \
   --form token=TOKEN \
   --form ref=main \
-  --form "variables[UPLOAD_TO_S3]=true" \
+  --form variables[UPLOAD_TO_S3]="true" \
   "https://gitlab.example.com/api/v4/projects/123456/trigger/pipeline"
 ```