diff --git a/json_annotation/lib/src/json_value.dart b/json_annotation/lib/src/json_value.dart
index e9fdb129c..9ada231e5 100644
--- a/json_annotation/lib/src/json_value.dart
+++ b/json_annotation/lib/src/json_value.dart
@@ -12,7 +12,7 @@ class JsonValue {
   /// Optional values that can be used when deserializing.
   ///
   /// The elements of [aliases] must be either [String] or [int].
-  final List<Object?> aliases;
+  final Set<Object?> aliases;
 
-  const JsonValue(this.value, {this.aliases = const []});
+  const JsonValue(this.value, {this.aliases = const {}});
 }
diff --git a/json_serializable/lib/src/enum_utils.dart b/json_serializable/lib/src/enum_utils.dart
index 1e7d962e5..833124ee8 100644
--- a/json_serializable/lib/src/enum_utils.dart
+++ b/json_serializable/lib/src/enum_utils.dart
@@ -121,7 +121,7 @@ Map<Object?, FieldElement>? _enumAliases(
         jsonEnum: jsonEnum,
         targetType: targetType,
       ): field,
-      for (final alias in _generateAlias(field: field, targetType: targetType))
+      for (final alias in _generateAliases(field: field, targetType: targetType))
         alias: field,
     },
   };
@@ -192,7 +192,7 @@ Object? _generateEntry({
   }
 }
 
-List<Object?> _generateAlias({
+List<Object?> _generateAliases({
   required FieldElement field,
   required DartType targetType,
 }) {
@@ -208,7 +208,7 @@ List<Object?> _generateAlias({
 
     if (valueReader.validAliasesType) {
       return [
-        for (final value in valueReader.listValue)
+        for (final value in valueReader.setValue)
           ConstantReader(value).literalValue,
       ];
     } else {