diff --git a/src/ServerlessSpy.ts b/src/ServerlessSpy.ts
index 100cc5b..6d1ae0e 100644
--- a/src/ServerlessSpy.ts
+++ b/src/ServerlessSpy.ts
@@ -594,7 +594,7 @@ export class ServerlessSpy extends Construct {
       tableStreamArnDescriptor === undefined ||
       tableStreamArnDescriptor.get === undefined
     ) {
-      (table as any).tableStreamArn = (
+      (table as any)['tableStreamArn'] = (
         table.node.defaultChild as dynamoDb.CfnTable
       ).attrStreamArn;
     }