diff --git a/Jenkinsfile b/Jenkinsfile
index 4ec8665..53b92d2 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -6,7 +6,7 @@ pipeline {
 	stages {
 		stage('build') {
 			agent {
-				docker { image '${env.DOCKER_PREFIX}/picosdk' }
+				docker { image "${env.DOCKER_PREFIX}/picosdk" }
 			}
 			steps {
 				sh 'mkdir -p build'