diff --git a/internal/ceres/cxsparse.h b/internal/ceres/cxsparse.h
index 28238d5..d3f76e0 100644
--- a/internal/ceres/cxsparse.h
+++ b/internal/ceres/cxsparse.h
@@ -145,12 +145,12 @@
 
   // SparseCholesky interface.
   virtual ~CXSparseCholesky();
-  virtual CompressedRowSparseMatrix::StorageType StorageType() const;
-  virtual LinearSolverTerminationType Factorize(CompressedRowSparseMatrix* lhs,
-                                                std::string* message);
-  virtual LinearSolverTerminationType Solve(const double* rhs,
-                                            double* solution,
-                                            std::string* message);
+  CompressedRowSparseMatrix::StorageType StorageType() const final;
+  LinearSolverTerminationType Factorize(CompressedRowSparseMatrix* lhs,
+                                        std::string* message) final;
+  LinearSolverTerminationType Solve(const double* rhs,
+                                    double* solution,
+                                    std::string* message) final;
 
  private:
   CXSparseCholesky(const OrderingType ordering_type);
@@ -166,7 +166,7 @@
 }  // namespace internal
 }  // namespace ceres
 
-#else   // CERES_NO_CXSPARSE
+#else
 
 typedef void cs_dis;