diff --git a/lib/config/config.dart b/lib/config/config.dart
index 3b21b6409f..1e401381a9 100644
--- a/lib/config/config.dart
+++ b/lib/config/config.dart
@@ -174,7 +174,7 @@ class Config {
   final MacOSConfig? macOSConfig;
 
   /// Creates [Config] icons from [json]
-  factory Config.fromJson(Map<dynamic, dynamic> json) => _$ConfigFromJson(json);
+  factory Config.fromJson(Map<String, dynamic> json) => _$ConfigFromJson(json);
 
   /// whether or not there is configuration for adaptive icons for android
   bool get hasAndroidAdaptiveConfig =>