diff --git a/Jenkinsfile b/Jenkinsfile
index 9551141..2c84066 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -32,9 +32,9 @@ pipeline {
                 script {
                     echo "building the docker image..."
                     withCredentials([usernamePassword(credentialsId: 'docker-hub-repo', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
-                        sh "docker build -t nanajanashia/demo-app:$IMAGE_NAME ."
+                        sh "docker build -t nanajanashia/demo-app:${IMAGE_NAME} ."
                         sh "echo $PASS | docker login -u $USER --password-stdin"
-                        sh "docker push nanajanashia/demo-app:$IMAGE_NAME"
+                        sh "docker push nanajanashia/demo-app:${IMAGE_NAME}"
                     }
                 }
             }