diff --git a/Jenkinsfile b/Jenkinsfile
index c9a0270..d463c80 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -45,7 +45,8 @@ pipeline {
     stage('Build production deliverable') {
       steps {
         script {
-          env.ZIP_FILE="url-shortener_$(date "+%Y-%m-%d_%H-%M-%S").tgz"
+          ZIP_DATE=$(date "+%Y-%m-%d_%H-%M-%S")
+          env.ZIP_FILE="url-shortener_$ZIP_DATE" 
         }
         catchError(buildResult: 'FAILURE', stageResult: 'FAILURE') {
           sh ''' #!/usr/local/bin/bash