diff --git a/common/values/custom_map_value_test.cc b/common/values/custom_map_value_test.cc
index 57dd22277..a38ffe537 100644
--- a/common/values/custom_map_value_test.cc
+++ b/common/values/custom_map_value_test.cc
@@ -91,10 +91,10 @@ class CustomMapValueInterfaceTest final : public CustomMapValueInterface {
     (*json_object.mutable_fields())["foo"].set_bool_value(true);
     (*json_object.mutable_fields())["bar"].set_number_value(1.0);
     absl::Cord serialized;
-    if (!json_object.SerializePartialToCord(&serialized)) {
+    if (!json_object.SerializePartialToString(&serialized)) {
       return absl::UnknownError("failed to serialize google.protobuf.Struct");
     }
-    if (!json->ParsePartialFromCord(serialized)) {
+    if (!json->ParsePartialFromString(serialized)) {
       return absl::UnknownError("failed to parse google.protobuf.Struct");
     }
     return absl::OkStatus();
@@ -224,11 +224,11 @@ class CustomMapValueTest : public common_internal::ValueTest<> {
           (*json_object.mutable_fields())["foo"].set_bool_value(true);
           (*json_object.mutable_fields())["bar"].set_number_value(1.0);
           absl::Cord serialized;
-          if (!json_object.SerializePartialToCord(&serialized)) {
+          if (!json_object.SerializePartialToString(&serialized)) {
             return absl::UnknownError(
                 "failed to serialize google.protobuf.Struct");
           }
-          if (!json->ParsePartialFromCord(serialized)) {
+          if (!json->ParsePartialFromString(serialized)) {
             return absl::UnknownError("failed to parse google.protobuf.Struct");
           }
           return absl::OkStatus();