diff --git a/packages/editor-ui/src/Interface.ts b/packages/editor-ui/src/Interface.ts
index 88bf34e9f0..8f1a2a3695 100644
--- a/packages/editor-ui/src/Interface.ts
+++ b/packages/editor-ui/src/Interface.ts
@@ -36,7 +36,7 @@ declare module 'jsplumb' {
 	}
 
 	interface Connection {
-		__meta: {
+		__meta?: {
 			sourceNodeName: string,
 			sourceOutputIndex: number,
 			targetNodeName: string,