diff --git a/Jenkinsfile b/Jenkinsfile
index 7734598..3a7d940 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -25,7 +25,7 @@ pipeline {
                     }
 
                     env.VERSION = sh(
-                        env: ["VERSION_FILE=${versionFile}"],
+                        env: ["VERSION_FILE=${versionFile.toString()}"],
                         script: '''
                             set -e
                             VERSION=$(sed -n 's/^version=//p' "$VERSION_FILE")