diff --git a/.github/workflows/libcxx-check-generated-files.yml b/.github/workflows/libcxx-check-generated-files.yml
index 6f2d01ee0a56f..570055624b2a8 100644
--- a/.github/workflows/libcxx-check-generated-files.yml
+++ b/.github/workflows/libcxx-check-generated-files.yml
@@ -4,6 +4,9 @@ on:
     paths:
       - 'libcxx/**'
 
+permissions:
+  contents: read
+
 jobs:
   check_generated_files:
     runs-on: ubuntu-latest