diff --git a/lib/config/app_config.dart b/lib/config/app_config.dart
index bc8ebe9..9c47564 100644
--- a/lib/config/app_config.dart
+++ b/lib/config/app_config.dart
@@ -114,10 +114,11 @@ class AppConfig {
   }
 
   static String _randomWildcardLabel() {
-    final digits = StringBuffer(_random.nextInt(9) + 1);
-    for (var index = 1; index < 16; index += 1) {
-      digits.write(_random.nextInt(10));
+    const alphabet = 'abcdefghijklmnopqrstuvwxyz0123456789';
+    final label = StringBuffer();
+    for (var index = 0; index < 6; index += 1) {
+      label.write(alphabet[_random.nextInt(alphabet.length)]);
     }
-    return digits.toString();
+    return label.toString();
   }
 }