diff --git a/.github/workflows/push_subrepos.yml b/.github/workflows/push_subrepos.yml
index b5262566..2105ecad 100644
--- a/.github/workflows/push_subrepos.yml
+++ b/.github/workflows/push_subrepos.yml
@@ -15,4 +15,6 @@ jobs:
       run: |
         git config user.name 'Repository synchronization automation'
         git config user.email 'stephen@hexops.com'
+        # See https://github.community/t/automating-push-to-public-repo/17742/12
+        git config -l | grep 'http\..*\.extraheader' | cut -d= -f1 | xargs -L1 git config --unset-all
         ./dev/push-subrepos.sh