diff --git a/main.go b/main.go
index a81eb7a..711d1d6 100644
--- a/main.go
+++ b/main.go
@@ -18,6 +18,11 @@ func main() {
 }
 func randomNumber(w http.ResponseWriter, r *http.Request) {
 	name := r.URL.Query().Get("name")
+	if len(name) > 15 {
+		w.WriteHeader(400)
+		return
+	}
+
 	chance, err := strconv.Atoi(r.URL.Query().Get("chance"))
 	if err != nil {
 		w.WriteHeader(400)