diff --git a/lib/models/suggestion_response.dart b/lib/models/suggestion_response.dart
index 1c03b96..2e54f3f 100644
--- a/lib/models/suggestion_response.dart
+++ b/lib/models/suggestion_response.dart
@@ -63,6 +63,7 @@ class Suggestion {
   Map<String, dynamic> toJson() => _$SuggestionToJson(this);
 }
 
+@JsonSerializable()
 class ExternalIds {
   ExternalIds({
     this.foursquare,
@@ -72,13 +73,8 @@ class ExternalIds {
   final String? foursquare;
   final String? safegraph;
 
-  factory ExternalIds.fromJson(Map<String, dynamic> json) => ExternalIds(
-        foursquare: json["foursquare"],
-        safegraph: json["safegraph"],
-      );
+  factory ExternalIds.fromJson(Map<String, dynamic> json) =>
+      _$ExternalIdsFromJson(json);
 
-  Map<String, dynamic> toJson() => {
-        "foursquare": foursquare,
-        "safegraph": safegraph,
-      };
+  Map<String, dynamic> toJson() => _$ExternalIdsToJson(this);
 }
diff --git a/lib/models/suggestion_response.g.dart b/lib/models/suggestion_response.g.dart
index c8374b0..fd4f985 100644
--- a/lib/models/suggestion_response.g.dart
+++ b/lib/models/suggestion_response.g.dart
@@ -68,3 +68,14 @@ Map<String, dynamic> _$SuggestionToJson(Suggestion instance) =>
       'brand': instance.brand,
       'brand_id': instance.brandId,
     };
+
+ExternalIds _$ExternalIdsFromJson(Map<String, dynamic> json) => ExternalIds(
+      foursquare: json['foursquare'] as String?,
+      safegraph: json['safegraph'] as String?,
+    );
+
+Map<String, dynamic> _$ExternalIdsToJson(ExternalIds instance) =>
+    <String, dynamic>{
+      'foursquare': instance.foursquare,
+      'safegraph': instance.safegraph,
+    };