diff --git a/extensions/protobuf/bind_proto_to_activation_test.cc b/extensions/protobuf/bind_proto_to_activation_test.cc
index fd79508ac..680b4b353 100644
--- a/extensions/protobuf/bind_proto_to_activation_test.cc
+++ b/extensions/protobuf/bind_proto_to_activation_test.cc
@@ -76,10 +76,10 @@ TEST_F(BindProtoToActivationTest, BindProtoToActivationSkip) {
 
   EXPECT_THAT(activation.FindVariable("single_int32", descriptor_pool(),
                                       message_factory(), arena()),
-              IsOkAndHolds(Eq(absl::nullopt)));
+              IsOkAndHolds(Eq(std::nullopt)));
   EXPECT_THAT(activation.FindVariable("single_sint32", descriptor_pool(),
                                       message_factory(), arena()),
-              IsOkAndHolds(Eq(absl::nullopt)));
+              IsOkAndHolds(Eq(std::nullopt)));
 }
 
 TEST_F(BindProtoToActivationTest, BindProtoToActivationDefault) {