diff --git a/.github/workflows/iwyu.yml b/.github/workflows/iwyu.yml
index dd6d10278..e796155c5 100644
--- a/.github/workflows/iwyu.yml
+++ b/.github/workflows/iwyu.yml
@@ -2,7 +2,10 @@
 # Environment reference https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners
 name: include-what-you-use
 
-on: workflow_dispatch
+on:
+  schedule:
+    - cron: '0 0 * * 0'
+  workflow_dispatch:
 
 permissions:
   contents: read