diff --git a/Pipeline/Jenkinsfile b/Pipeline/Jenkinsfile
index 12d6ade..9e57eb2 100644
--- a/Pipeline/Jenkinsfile
+++ b/Pipeline/Jenkinsfile
@@ -19,12 +19,12 @@ pipeline {
                 echo ""
 
                 echo "checking out build scripts"
-                dir(${DIR_SCRIPTS}){
+                dir("${DIR_SCRIPTS}"){
                     git "${REPO_SCRIPTS}"
                 }
-                dir(${DIR_GLUON}){
-                    git url: ${REPO_GLUON}
-                        branch: ${VERSION}
+                dir("${DIR_GLUON}"){
+                    git url: "${REPO_GLUON}"
+                        branch: "${VERSION}"
                 }
                 sh "ls -l"
             }