diff --git a/gradle-plugins/cordformation/src/main/groovy/com/r3corda/plugins/Node.groovy b/gradle-plugins/cordformation/src/main/groovy/com/r3corda/plugins/Node.groovy
index c47e980812..a3945dfaab 100644
--- a/gradle-plugins/cordformation/src/main/groovy/com/r3corda/plugins/Node.groovy
+++ b/gradle-plugins/cordformation/src/main/groovy/com/r3corda/plugins/Node.groovy
@@ -198,7 +198,7 @@ class Node {
                     "dirName": dirName,
                     "nearestCity": nearestCity,
                     "isHttps": isHttps,
-                    "advertisedServices": advertisedServices,
+                    "advertisedServices": advertisedServices.join(","),
                     "networkMapAddress": networkMapAddress,
                     "artemisPort": artemisPort.toString(),
                     "webPort": webPort.toString()