diff --git a/bin/build-index.py b/bin/build-index.py
index be3a52ca200b..e7e76003686a 100644
--- a/bin/build-index.py
+++ b/bin/build-index.py
@@ -123,6 +123,7 @@ def create_symlink(shortname, spec_folder):
 
 
 CURRENT_WORK_EXCEPTIONS = {
+    "compositing": 2,
     "css-conditional": 5,
     "css-easing": 2,
     "css-grid": 2,