diff --git a/test/lib/next-modes/base.ts b/test/lib/next-modes/base.ts
index 118474f461628d0..7c26af2cbac8541 100644
--- a/test/lib/next-modes/base.ts
+++ b/test/lib/next-modes/base.ts
@@ -40,7 +40,7 @@ export class NextInstance {
     installCommand,
     buildCommand,
     startCommand,
-    packageJson,
+    packageJson = {},
   }: {
     files: {
       [filename: string]: string | FileRef