diff --git a/lib/src/country_codes.dart b/lib/src/country_codes.dart
index f39da62..f4b3baf 100644
--- a/lib/src/country_codes.dart
+++ b/lib/src/country_codes.dart
@@ -85,9 +85,7 @@ class CountryCodes {
 
   /// Returns the `CountryDetails` for the given country alpha2 code.
   static CountryDetails detailsFromAlpha2(String alpha2) {
-   return CountryDetails.fromMap(codes.entries
-        .where((entry) => entry["alpha2Code"] == alpha2)
-        .single);
+    return CountryDetails.fromMap(codes.entries.where((entry) => entry.key == alpha2).single);
   }