diff --git a/packages/nodes-base/nodes/Zulip/Zulip.node.ts b/packages/nodes-base/nodes/Zulip/Zulip.node.ts
index 5dbcc67715..14de8131dd 100644
--- a/packages/nodes-base/nodes/Zulip/Zulip.node.ts
+++ b/packages/nodes-base/nodes/Zulip/Zulip.node.ts
@@ -343,10 +343,10 @@ export class Zulip implements INodeType {
 						const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
 
 						if (additionalFields.description) {
-							body.description = additionalFields.description as string;
+							body.description = JSON.stringify(additionalFields.description as string);
 						}
 						if (additionalFields.newName) {
-							body.new_name = additionalFields.newName as string;
+							body.new_name = JSON.stringify(additionalFields.newName as string);
 						}
 						if (additionalFields.isPrivate) {
 							body.is_private = additionalFields.isPrivate as boolean;
@@ -412,7 +412,7 @@ export class Zulip implements INodeType {
 					const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
 
 					if (additionalFields.fullName) {
-						body.full_name = additionalFields.fullName as string;
+						body.full_name = JSON.stringify(additionalFields.fullName as string);
 					}
 					if (additionalFields.isAdmin) {
 						body.is_admin = additionalFields.isAdmin as boolean;