diff --git a/packages/nodes-base/nodes/EmailReadImap.node.ts b/packages/nodes-base/nodes/EmailReadImap.node.ts
index 9ef58802e7..9c01ff5b53 100644
--- a/packages/nodes-base/nodes/EmailReadImap.node.ts
+++ b/packages/nodes-base/nodes/EmailReadImap.node.ts
@@ -69,7 +69,7 @@ export class EmailReadImap implements INodeType {
 				displayOptions: {
 					show: {
 						downloadAttachments: [
-							'true'
+							true
 						],
 					},
 				},
@@ -90,7 +90,6 @@ export class EmailReadImap implements INodeType {
 		}
 
 		const mailbox = this.getNodeParameter('mailbox') as string;
-		const dataPropertyAttachmentsPrefixName = this.getNodeParameter('dataPropertyAttachmentsPrefixName') as string;
 		const postProcessAction = this.getNodeParameter('postProcessAction') as string;
 		const downloadAttachments = this.getNodeParameter('downloadAttachments') as boolean;
 
@@ -160,6 +159,11 @@ export class EmailReadImap implements INodeType {
 			let attachments: IBinaryData[];
 			let propertyName: string;
 
+			let dataPropertyAttachmentsPrefixName = '';
+			if (downloadAttachments === true) {
+				dataPropertyAttachmentsPrefixName = this.getNodeParameter('dataPropertyAttachmentsPrefixName') as string;
+			}
+
 			// All properties get by default moved to metadata except the ones
 			// which are defined here which get set on the top level.
 			const topLevelProperties = [