diff --git a/web/server.go b/web/server.go
index 0cd2f9a..a068297 100644
--- a/web/server.go
+++ b/web/server.go
@@ -929,7 +929,7 @@ func (s *Server) handleAdminEvents() http.HandlerFunc {
 // handleValidateCarNumber handles the validate car number API endpoint
 func (s *Server) handleValidateCarNumber() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		carNumber := r.URL.Query().Get("value")
+		carNumber := r.URL.Query().Get("car_number")
 		if carNumber == "" {
 			http.Error(w, "Car number is required", http.StatusBadRequest)
 			return