diff --git a/deploy.sh b/deploy.sh
index 004a49d..0d87f39 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -88,13 +88,17 @@ check_port() {
     return
   fi
 
-  # Check if it belongs to our own docker containers
-  local proc_name
-  proc_name=$(cat "/proc/${pid}/comm" 2>/dev/null || echo "unknown")
+  # Check if it belongs to OUR docker-compose project (not other apps on server)
+  local our_ids
+  our_ids=$(docker compose -f docker-compose.yml -f docker-compose.prod.yml ps -q 2>/dev/null || true)
 
-  if [[ "$proc_name" == "docker"* ]] || [[ "$proc_name" == "containerd"* ]]; then
-    info "  Port $port ($service): used by Docker (will be replaced on restart)"
-    return
+  if [[ -n "$our_ids" ]]; then
+    # shellcheck disable=SC2086
+    if docker inspect $our_ids 2>/dev/null \
+        | grep -q "\"HostPort\": \"${port}\""; then
+      info "  Port $port ($service): used by our container (will be replaced on restart)"
+      return
+    fi
   fi
 
   warn "  Port $port ($service) is in use by PID $pid ($proc_name)"