diff --git a/tools/isobuild/compiler-plugin.js b/tools/isobuild/compiler-plugin.js
index 089686ddc9..d978e00435 100644
--- a/tools/isobuild/compiler-plugin.js
+++ b/tools/isobuild/compiler-plugin.js
@@ -898,3 +898,12 @@ _.each([
     proto[method]
   );
 });
+
+// static methods to measure in profile
+_.each([
+  "computeJsOutputFilesMap"
+], method => {
+  PackageSourceBatch[method] = Profile(
+    "PackageSourceBatch." + method,
+    PackageSourceBatch[method]);
+});