diff --git a/internal/ceres/loss_function.cc b/internal/ceres/loss_function.cc
index 353f29a..82563c8 100644
--- a/internal/ceres/loss_function.cc
+++ b/internal/ceres/loss_function.cc
@@ -1,5 +1,5 @@
 // Ceres Solver - A fast non-linear least squares minimizer
-// Copyright 2015 Google Inc. All rights reserved.
+// Copyright 2023 Google Inc. All rights reserved.
 // http://ceres-solver.org/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -39,6 +39,8 @@
 
 namespace ceres {
 
+LossFunction::~LossFunction() = default;
+
 void TrivialLoss::Evaluate(double s, double rho[3]) const {
   rho[0] = s;
   rho[1] = 1.0;
@@ -161,7 +163,7 @@
 }
 
 void ScaledLoss::Evaluate(double s, double rho[3]) const {
-  if (rho_.get() == NULL) {
+  if (rho_.get() == nullptr) {
     rho[0] = a_ * s;
     rho[1] = a_;
     rho[2] = 0.0;