diff --git a/tools/isobuild/compiler.js b/tools/isobuild/compiler.js
index aeafd54d1f..b67faf82db 100644
--- a/tools/isobuild/compiler.js
+++ b/tools/isobuild/compiler.js
@@ -557,6 +557,7 @@ api.addAssets('${relPath}', 'client').`);
 
     const contents = optimisticReadFile(absPath);
     const hash = optimisticHashOrNull(absPath);
+    const file = { contents, hash };
     watchSet.addFile(absPath, hash);
 
     Console.nudge(true);