diff --git a/bin/main.dart b/bin/main.dart
index ebb2694..ba6dad0 100644
--- a/bin/main.dart
+++ b/bin/main.dart
@@ -1,3 +1,4 @@
+import "dart:convert";
 import "dart:io";
 import "package:cli_tools/config.dart";
 import "package:http/http.dart" as http;
@@ -31,9 +32,9 @@ void main(List<String> argsRaw) async {
 
               if (authResponse.statusCode != 200) {
                 return Response.internalServerError(
-                  body: {
+                  body: json.encode({
                     "error": "An error occurred: ${authResponse.statusCode}.",
-                  },
+                  }),
                   headers: {HttpHeaders.contentTypeHeader: "application/json"},
                 );
               }