diff --git a/Jenkinsfile b/Jenkinsfile
index 5a671c2..588fde7 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -18,11 +18,13 @@ pipeline {
         }
         stage('sh: Shell Script') {
             steps {
-                def image = docker.build('dock')
-                image.inside{
-                    sh 'chmod +x preparations.sh'
-                    sh 'echo ${CUTOFF}'
-                    sh './preparations.sh ${CUTOFF}'
+                script {
+                    def image = docker.build('dock')
+                    image.inside{
+                        sh 'chmod +x preparations.sh'
+                        sh 'echo ${CUTOFF}'
+                        sh './preparations.sh ${CUTOFF}'
+                    }
                 }
             }
         }