examples/grok-pull.post_update_hook.sh | 8 +++++++-

diff --git a/examples/grok-pull.post_update_hook.sh b/examples/grok-pull.post_update_hook.sh
index ab4e54e7bf0630c95728cfbe769e6fd08ad4f8c0..d003448eb81b0f5328f31c178751584839dfe74d 100755
--- a/examples/grok-pull.post_update_hook.sh
+++ b/examples/grok-pull.post_update_hook.sh
@@ -26,7 +26,13 @@ 	msgmap="$inbox_dir"/public-inbox/msgmap.sqlite3
 fi
 
 # run public-inbox-init iff unconfigured
-cfg_dir=$(git config -f "$PI_CONFIG" publicinbox."$inbox_name".dir)
+cfg_dir=$(git config -f "$PI_CONFIG" publicinbox."$inbox_name".inboxdir)
+
+# check legacy name for "inboxdir"
+case $cfg_dir in
+'') cfg_dir=$(git config -f "$PI_CONFIG" publicinbox."$inbox_name".mainrepo) ;;
+esac
+
 case $cfg_dir in
 '')
 	remote_git_url=$(git --git-dir="$full_git_dir" config remote.origin.url)