diff --git a/src/uk/org/gss_data/pmd_drafter/api/DraftsetsApi.groovy b/src/uk/org/gss_data/pmd_drafter/api/DraftsetsApi.groovy
index 68f02af..0d86300 100644
--- a/src/uk/org/gss_data/pmd_drafter/api/DraftsetsApi.groovy
+++ b/src/uk/org/gss_data/pmd_drafter/api/DraftsetsApi.groovy
@@ -3,7 +3,7 @@
 import uk.org.gss_data.pmd_drafter.model.AsyncJob
 import uk.org.gss_data.pmd_drafter.model.Draftset
 
-class DraftsetsApi extends ApiUtils {
+class DraftsetsApi extends ApiUtils implements Serializable {
     String basePath = "https://localhost/v1"
     String versionPath = "/api/v1"
     String auth = "Basic "