diff --git a/Jenkinsfile b/Jenkinsfile
index a159cc9ecd..3d27d513cb 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,3 +1,5 @@
+#!/usr/bin/env groovy
+
 def ci_checkers_targets = [
     ["commit-checker", "openttd/compile-farm-ci:commit-checker"],
 ]