diff --git a/internal/ceres/line_search_minimizer.cc b/internal/ceres/line_search_minimizer.cc
index f43278c..684a736 100644
--- a/internal/ceres/line_search_minimizer.cc
+++ b/internal/ceres/line_search_minimizer.cc
@@ -284,4 +284,4 @@
 }  // namespace internal
 }  // namespace ceres
 
-#endif // CERES_NO_LINE_SEARCH_MINIMIZER
+#endif  // CERES_NO_LINE_SEARCH_MINIMIZER
diff --git a/internal/ceres/schur_complement_solver.cc b/internal/ceres/schur_complement_solver.cc
index bd68c45..bc9e28a 100644
--- a/internal/ceres/schur_complement_solver.cc
+++ b/internal/ceres/schur_complement_solver.cc
@@ -366,6 +366,6 @@
 }
 #endif  // CERES_NO_CXPARSE
 
-#endif // !defined(CERES_NO_SUITESPARSE) || !defined(CERES_NO_CXSPARE)
+#endif  // !defined(CERES_NO_SUITESPARSE) || !defined(CERES_NO_CXSPARE)
 }  // namespace internal
 }  // namespace ceres
diff --git a/internal/ceres/solver_impl.cc b/internal/ceres/solver_impl.cc
index 7ea6d1f..ffc347e 100644
--- a/internal/ceres/solver_impl.cc
+++ b/internal/ceres/solver_impl.cc
@@ -807,7 +807,7 @@
   summary->postprocessor_time_in_seconds =
       WallTimeInSeconds() - post_process_start_time;
 }
-#endif // CERES_NO_LINE_SEARCH_MINIMIZER
+#endif  // CERES_NO_LINE_SEARCH_MINIMIZER
 
 bool SolverImpl::IsOrderingValid(const Solver::Options& options,
                                  const ProblemImpl* problem_impl,
diff --git a/internal/ceres/solver_impl.h b/internal/ceres/solver_impl.h
index d2a2dd1..c054830 100644
--- a/internal/ceres/solver_impl.h
+++ b/internal/ceres/solver_impl.h
@@ -80,7 +80,7 @@
                                  Evaluator* evaluator,
                                  double* parameters,
                                  Solver::Summary* summary);
-#endif // CERES_NO_LINE_SEARCH_MINIMIZER
+#endif  // CERES_NO_LINE_SEARCH_MINIMIZER
 
   // Create the transformed Program, which has all the fixed blocks
   // and residuals eliminated, and in the case of automatic schur