diff --git a/internal/ceres/detect_structure.cc b/internal/ceres/detect_structure.cc
index 4aac445..e82d70f 100644
--- a/internal/ceres/detect_structure.cc
+++ b/internal/ceres/detect_structure.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
@@ -33,8 +33,7 @@
 #include "ceres/internal/eigen.h"
 #include "glog/logging.h"
 
-namespace ceres {
-namespace internal {
+namespace ceres::internal {
 
 void DetectStructure(const CompressedRowBlockStructure& bs,
                      const int num_eliminate_blocks,
@@ -119,5 +118,4 @@
   // clang-format on
 }
 
-}  // namespace internal
-}  // namespace ceres
+}  // namespace ceres::internal