diff --git a/.github/workflows/diff_headers.yml b/.github/workflows/diff_headers.yml
index 3ea6e7d..6437d3b 100644
--- a/.github/workflows/diff_headers.yml
+++ b/.github/workflows/diff_headers.yml
@@ -1,7 +1,6 @@
 name: Diff headers
 
 on:
-  pull_request:
   workflow_dispatch:
     inputs:
       base-version: