diff --git a/common/values/parsed_map_field_value.cc b/common/values/parsed_map_field_value.cc
index 6a0e3cc5d..a9d04f039 100644
--- a/common/values/parsed_map_field_value.cc
+++ b/common/values/parsed_map_field_value.cc
@@ -165,7 +165,6 @@ ParsedMapFieldValue ParsedMapFieldValue::Clone(Allocator<> allocator) const {
   auto cloned_field =
       cloned->GetReflection()->GetMutableRepeatedFieldRef<google::protobuf::Message>(
           cel::to_address(cloned), field_);
-  cloned_field.Reserve(field.size());
   cloned_field.CopyFrom(field);
   return ParsedMapFieldValue(std::move(cloned), field_);
 }
diff --git a/common/values/parsed_repeated_field_value.cc b/common/values/parsed_repeated_field_value.cc
index e66eba49c..a288bba88 100644
--- a/common/values/parsed_repeated_field_value.cc
+++ b/common/values/parsed_repeated_field_value.cc
@@ -160,7 +160,6 @@ ParsedRepeatedFieldValue ParsedRepeatedFieldValue::Clone(
   auto cloned_field =
       cloned->GetReflection()->GetMutableRepeatedFieldRef<google::protobuf::Message>(
           cel::to_address(cloned), field_);
-  cloned_field.Reserve(field.size());
   cloned_field.CopyFrom(field);
   return ParsedRepeatedFieldValue(std::move(cloned), field_);
 }
diff --git a/internal/json.cc b/internal/json.cc
index f557a5491..44e1f4f63 100644
--- a/internal/json.cc
+++ b/internal/json.cc
@@ -806,7 +806,6 @@ class MessageToJsonState {
     if (size == 0) {
       return absl::OkStatus();
     }
-    ReserveValues(result, size);
     CEL_ASSIGN_OR_RETURN(const auto to_value, GetRepeatedFieldToValue(field));
     for (int index = 0; index < size; ++index) {
       CEL_RETURN_IF_ERROR((this->*to_value)(reflection, message, field, index,
@@ -995,9 +994,6 @@ class MessageToJsonState {
   virtual absl::Nonnull<google::protobuf::MessageLite*> MutableStructValue(
       absl::Nonnull<google::protobuf::MessageLite*> message) const = 0;
 
-  virtual void ReserveValues(absl::Nonnull<google::protobuf::MessageLite*> message,
-                             int capacity) const = 0;
-
   virtual absl::Nonnull<google::protobuf::MessageLite*> AddValues(
       absl::Nonnull<google::protobuf::MessageLite*> message) const = 0;
 
@@ -1076,13 +1072,6 @@ class GeneratedMessageToJsonState final : public MessageToJsonState {
         google::protobuf::DownCastMessage<google::protobuf::Value>(message));
   }
 
-  void ReserveValues(absl::Nonnull<google::protobuf::MessageLite*> message,
-                     int capacity) const override {
-    ListValueReflection::ReserveValues(
-        google::protobuf::DownCastMessage<google::protobuf::ListValue>(message),
-        capacity);
-  }
-
   absl::Nonnull<google::protobuf::MessageLite*> AddValues(
       absl::Nonnull<google::protobuf::MessageLite*> message) const override {
     return ListValueReflection::AddValues(
@@ -1163,12 +1152,6 @@ class DynamicMessageToJsonState final : public MessageToJsonState {
         google::protobuf::DownCastMessage<google::protobuf::Message>(message));
   }
 
-  void ReserveValues(absl::Nonnull<google::protobuf::MessageLite*> message,
-                     int capacity) const override {
-    reflection_.ListValue().ReserveValues(
-        google::protobuf::DownCastMessage<google::protobuf::Message>(message), capacity);
-  }
-
   absl::Nonnull<google::protobuf::MessageLite*> AddValues(
       absl::Nonnull<google::protobuf::MessageLite*> message) const override {
     return reflection_.ListValue().AddValues(
@@ -2172,9 +2155,6 @@ class JsonMutator {
   virtual absl::Nonnull<google::protobuf::MessageLite*> MutableListValue(
       absl::Nonnull<google::protobuf::MessageLite*> message) const = 0;
 
-  virtual void ReserveValues(absl::Nonnull<google::protobuf::MessageLite*> message,
-                             int capacity) const = 0;
-
   virtual absl::Nonnull<google::protobuf::MessageLite*> AddValues(
       absl::Nonnull<google::protobuf::MessageLite*> message) const = 0;
 
@@ -2223,13 +2203,6 @@ class GeneratedJsonMutator final : public JsonMutator {
         google::protobuf::DownCastMessage<google::protobuf::Value>(message));
   }
 
-  void ReserveValues(absl::Nonnull<google::protobuf::MessageLite*> message,
-                     int capacity) const override {
-    ListValueReflection::ReserveValues(
-        google::protobuf::DownCastMessage<google::protobuf::ListValue>(message),
-        capacity);
-  }
-
   absl::Nonnull<google::protobuf::MessageLite*> AddValues(
       absl::Nonnull<google::protobuf::MessageLite*> message) const override {
     return ListValueReflection::AddValues(
@@ -2312,12 +2285,6 @@ class DynamicJsonMutator final : public JsonMutator {
         google::protobuf::DownCastMessage<google::protobuf::Message>(message));
   }
 
-  void ReserveValues(absl::Nonnull<google::protobuf::MessageLite*> message,
-                     int capacity) const override {
-    list_value_reflection_.ReserveValues(
-        google::protobuf::DownCastMessage<google::protobuf::Message>(message), capacity);
-  }
-
   absl::Nonnull<google::protobuf::MessageLite*> AddValues(
       absl::Nonnull<google::protobuf::MessageLite*> message) const override {
     return list_value_reflection_.AddValues(
@@ -2379,7 +2346,6 @@ class NativeJsonToProtoJsonState {
 
   absl::Status ToProtoJsonList(const JsonArray& json,
                                absl::Nonnull<google::protobuf::MessageLite*> proto) {
-    mutator_->ReserveValues(proto, static_cast<int>(json.size()));
     for (const auto& element : json) {
       CEL_RETURN_IF_ERROR(ToProtoJson(element, mutator_->AddValues(proto)));
     }
diff --git a/internal/well_known_types.cc b/internal/well_known_types.cc
index 2e9cae6c6..085269ecd 100644
--- a/internal/well_known_types.cc
+++ b/internal/well_known_types.cc
@@ -1534,15 +1534,6 @@ absl::Nonnull<google::protobuf::Message*> ListValueReflection::AddValues(
   return message->GetReflection()->AddMessage(message, values_field_);
 }
 
-void ListValueReflection::ReserveValues(absl::Nonnull<google::protobuf::Message*> message,
-                                        int capacity) const {
-  ABSL_DCHECK(IsInitialized());
-  ABSL_DCHECK_EQ(message->GetDescriptor(), descriptor_);
-  if (capacity > 0) {
-    MutableValues(message).Reserve(capacity);
-  }
-}
-
 absl::StatusOr<ListValueReflection> GetListValueReflection(
     absl::Nonnull<const Descriptor*> descriptor) {
   ListValueReflection reflection;
diff --git a/internal/well_known_types.h b/internal/well_known_types.h
index 2cef32a96..4c3e70d20 100644
--- a/internal/well_known_types.h
+++ b/internal/well_known_types.h
@@ -1066,13 +1066,6 @@ class ListValueReflection final {
     return message->add_values();
   }
 
-  static void ReserveValues(absl::Nonnull<GeneratedMessageType*> message,
-                            int capacity) {
-    if (capacity > 0) {
-      message->mutable_values()->Reserve(capacity);
-    }
-  }
-
   absl::Status Initialize(absl::Nonnull<const google::protobuf::DescriptorPool*> pool);
 
   absl::Status Initialize(absl::Nonnull<const google::protobuf::Descriptor*> descriptor);
@@ -1110,9 +1103,6 @@ class ListValueReflection final {
   absl::Nonnull<google::protobuf::Message*> AddValues(
       absl::Nonnull<google::protobuf::Message*> message) const;
 
-  void ReserveValues(absl::Nonnull<google::protobuf::Message*> message,
-                     int capacity) const;
-
  private:
   absl::Nullable<const google::protobuf::Descriptor*> descriptor_ = nullptr;
   absl::Nullable<const google::protobuf::FieldDescriptor*> values_field_ = nullptr;