diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 07ebdbc32..eefb0d079 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,6 +6,10 @@ on:
   push:
     branches:
     - master
+  # Trigger for changes in the whatwg/sg repo.
+  repository_dispatch:
+    types:
+    - sg
 jobs:
   build:
     name: Build