diff --git a/tools/isobuild/bundler.js b/tools/isobuild/bundler.js
index 57214a95a2..dda59cd2af 100644
--- a/tools/isobuild/bundler.js
+++ b/tools/isobuild/bundler.js
@@ -1177,26 +1177,6 @@ class Target {
         // ImportScanner's knowledge of which modules are really imported.
         this.watchSet.merge(entry.importScannerWatchSet);
       }
-
-      // Any source resource that the content or hash was accessed for are marked
-      // as definitely used.
-      // If there are any output resources for these in the js output, they are
-      // excluded from the importScannerWatchSet so they are only marked as
-      // definitely used if their content was used, not if they are added
-      // to the built app.
-      unibuild.resources.forEach(resource => {
-        if (resource.type !== 'source' || resource._dataUsed === false) {
-          return;
-        }
-
-        assert.strictEqual(
-          typeof resource._dataUsed,
-          "boolean"
-        );
-
-        let absPath = files.pathJoin(sourceRoot, resource.path);
-        this.watchSet.addFile(absPath, resource.hash);
-      });
     });
 
     if (buildmessage.jobHasMessages()) {