diff --git a/src/edu/internet2/jenkins/DockerBuild.groovy b/src/edu/internet2/jenkins/DockerBuild.groovy
index 44dcb1e..fc774f4 100644
--- a/src/edu/internet2/jenkins/DockerBuild.groovy
+++ b/src/edu/internet2/jenkins/DockerBuild.groovy
@@ -1,6 +1,6 @@
 package edu.internet2.jenkins;
 
-class DockerBuild {
+class DockerBuild implements Serializable {
   def steps
   def env
   DockerBuild(env){ this.env = env }