diff --git a/Jenkinsfile b/Jenkinsfile
index bd7d03b..0301070 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -263,6 +263,7 @@ PY
       steps {
         container('frontend') {
           sh '''
+            #!/usr/bin/env bash
             set -euo pipefail
             mkdir -p build
             cd frontend