diff --git a/Jenkinsfile b/Jenkinsfile
index 99eef3f..436d7a2 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -48,14 +48,15 @@ pipeline {
     stage('Build deliverable') {
       steps {
         catchError(buildResult: 'FAILURE', stageResult: 'FAILURE') {
-          sh 'mkdir -p url-shortener'
-          sh 'cp -R !(url-shortener) url-shortener/'
-          sh 'rm -rf url-shortener/features'
-          sh 'rm -rf url-shortener/spec'
-          sh 'rm -rf url-shortener/coverage'
-          sh 'tar -czvf url-shortener.tgz url-shortener/'
-          archiveArtifacts artifacts: 'url-shortener.tgz'
+          sh ''' #!/usr/local/bin/bash
+            mkdir -p url-shortener
+            shopt -s extglob
+            cp -R !(url-shortener) url-shortener/
+            rm -rf url-shortener/features url-shortener/spec url-shortener/coverage
+            tar -czvf url-shortener.tgz url-shortener/
+            '''
         }
+        archiveArtifacts artifacts: 'url-shortener.tgz'
       }
     }
     stage('Clean up deliverable') {