diff --git a/deploy/deploy.sh b/deploy/deploy.sh
index 6eccbe1..4d5150c 100755
--- a/deploy/deploy.sh
+++ b/deploy/deploy.sh
@@ -139,11 +139,14 @@ docker compose version >/dev/null 2>&1 || { err "docker compose v2 required"; ex
 VHOST=/etc/apache2/sites-enabled/optical-dev.oliver.solutions.conf
 if [[ -r "$VHOST" ]]; then
     # 1. Slug collision: is another app already claiming /utilisation-dept/?
-    #    Look at the live vhost AND every sibling app's apache-*.conf.
+    #    Look at the live vhost AND every sibling app's apache-*.conf,
+    #    filtering out our OWN conf (matched on REPO_ROOT, not SLUG, since
+    #    the on-disk path may not match the URL slug — e.g. cloned to
+    #    /opt/loreal-utilisation-dept/ with slug "utilisation-dept").
     sibling_confs=(/opt/*/deploy/apache-*.conf)
     collision=$(grep -lE "(ProxyPass|Alias)[[:space:]]+${URL_PATH}/" \
                     "$VHOST" "${sibling_confs[@]}" 2>/dev/null \
-                | grep -v "/opt/${SLUG}/" || true)
+                | grep -vF "${REPO_ROOT}/" || true)
     if [[ -n "$collision" ]]; then
         err "Another app claims ${URL_PATH}/ in:"
         echo "$collision" | sed 's/^/    /' >&2