diff --git a/Jenkinsfile.ci b/Jenkinsfile.ci
index a075521..2ba05e9 100644
--- a/Jenkinsfile.ci
+++ b/Jenkinsfile.ci
@@ -140,7 +140,7 @@ post {
 
           // Avoid interpolation of secret variables (https://www.jenkins.io/doc/book/pipeline/jenkinsfile/#string-interpolation)
           withEnv(["GITEA_COMMENTS_URL=${commentsUrl}", "GITEA_BODY=${body}"]) {
-            sh(label: 'Comentar en PR (Gitea)', script: '''
+            sh(label: 'Comentar en PR (Gitea)', shell: '/bin/bash', script: '''
               set -euo pipefail
 
               curl -sS -X POST \