diff --git a/Jenkinsfile b/Jenkinsfile
index 8fb9fc5..7aa5042 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -42,7 +42,7 @@ node('docker') {
             def grouper_version = (git_tag =~ tag_pattern)[0][1]
 
             println "Extracted grouper version '${grouper_version}' from input '${git_tag}'"
-            sh "echo JAVA_HOME=$JAVA_HOME"
+            sh 'echo JAVA_HOME=$JAVA_HOME'
             withMaven(
                 maven: maven_id,
                 mavenSettingsFilePath: "travis/mvn.settings.xml",
@@ -53,7 +53,7 @@ node('docker') {
         }
 
         stage('Build') {
-            sh "echo JAVA_HOME=$JAVA_HOME"
+            sh 'echo JAVA_HOME=$JAVA_HOME'
             withMaven(
                 maven: maven_id,
                 mavenSettingsFilePath: "travis/mvn.settings.xml",
@@ -66,7 +66,7 @@ node('docker') {
 
         stage('Release') {
             withCredentials([usernamePassword(credentialsId: sonatype_cred_id, usernameVariable: 'SONATYPE_USER', passwordVariable: 'SONATYPE_PWD')]) {
-                sh "echo JAVA_HOME=$JAVA_HOME"
+                sh 'echo JAVA_HOME=$JAVA_HOME'
                 withMaven(
                     maven: maven_id,
                     mavenSettingsFilePath: "travis/mvn.settings.xml",