diff --git a/protobuf/lib/src/protobuf/extension.dart b/protobuf/lib/src/protobuf/extension.dart
index dc37b91f..59a2b619 100644
--- a/protobuf/lib/src/protobuf/extension.dart
+++ b/protobuf/lib/src/protobuf/extension.dart
@@ -35,7 +35,6 @@ class Extension<T> extends FieldInfo<T> {
     String name,
     int tagNumber,
     int fieldType, {
-    required CheckFunc<T> check,
     CreateBuilderFunc? subBuilder,
     ValueOfFunc? valueOf,
     List<ProtobufEnum>? enumValues,
@@ -45,7 +44,7 @@ class Extension<T> extends FieldInfo<T> {
          tagNumber,
          null,
          fieldType,
-         check,
+         getCheckFunction(fieldType),
          subBuilder,
          valueOf: valueOf,
          enumValues: enumValues,
diff --git a/protoc_plugin/lib/src/extension_generator.dart b/protoc_plugin/lib/src/extension_generator.dart
index 229d1052..6d17d951 100644
--- a/protoc_plugin/lib/src/extension_generator.dart
+++ b/protoc_plugin/lib/src/extension_generator.dart
@@ -140,8 +140,6 @@ class ExtensionGenerator {
     named['protoName'] = _field.quotedProtoName;
     if (_field.isRepeated) {
       invocation = '$protobufImportPrefix.Extension<$dartType>.repeated';
-      named['check'] =
-          '$protobufImportPrefix.getCheckFunction(${_field.typeConstant})';
       if (type.isMessage || type.isGroup) {
         named['subBuilder'] = '$dartType.create';
       } else if (type.isEnum) {
diff --git a/protoc_plugin/lib/src/gen/google/api/client.pb.dart b/protoc_plugin/lib/src/gen/google/api/client.pb.dart
index 4660db8c..150bd783 100644
--- a/protoc_plugin/lib/src/gen/google/api/client.pb.dart
+++ b/protoc_plugin/lib/src/gen/google/api/client.pb.dart
@@ -1590,8 +1590,7 @@ class Client {
       _omitMessageNames ? '' : 'google.protobuf.MethodOptions',
       _omitFieldNames ? '' : 'methodSignature',
       1051,
-      $pb.PbFieldType.PS,
-      check: $pb.getCheckFunction($pb.PbFieldType.PS));
+      $pb.PbFieldType.PS);
   static final defaultHost = $pb.Extension<$core.String>(
       _omitMessageNames ? '' : 'google.protobuf.ServiceOptions',
       _omitFieldNames ? '' : 'defaultHost',