diff --git a/apps/web/tests/produced-files.test.ts b/apps/web/tests/produced-files.test.ts
index d30621315..9f554fd55 100644
--- a/apps/web/tests/produced-files.test.ts
+++ b/apps/web/tests/produced-files.test.ts
@@ -13,6 +13,7 @@ function file(name: string, kind: ProjectFile['kind']): ProjectFile {
     size: 1,
     mtime: 0,
     kind,
+    mime: kind === 'sketch' ? 'application/json' : 'text/html',
   };
 }