diff --git a/internal/ceres/preconditioner.cc b/internal/ceres/preconditioner.cc
index f98374e..69ba04d 100644
--- a/internal/ceres/preconditioner.cc
+++ b/internal/ceres/preconditioner.cc
@@ -29,13 +29,13 @@
 // Author: sameeragarwal@google.com (Sameer Agarwal)
 
 #include "ceres/preconditioner.h"
+
 #include "glog/logging.h"
 
 namespace ceres {
 namespace internal {
 
-Preconditioner::~Preconditioner() {
-}
+Preconditioner::~Preconditioner() {}
 
 PreconditionerType Preconditioner::PreconditionerForZeroEBlocks(
     PreconditionerType preconditioner_type) {
@@ -53,8 +53,7 @@
   CHECK(matrix != nullptr);
 }
 
-SparseMatrixPreconditionerWrapper::~SparseMatrixPreconditionerWrapper() {
-}
+SparseMatrixPreconditionerWrapper::~SparseMatrixPreconditionerWrapper() {}
 
 bool SparseMatrixPreconditionerWrapper::UpdateImpl(const SparseMatrix& A,
                                                    const double* D) {
@@ -66,7 +65,7 @@
   matrix_->RightMultiply(x, y);
 }
 
-int  SparseMatrixPreconditionerWrapper::num_rows() const {
+int SparseMatrixPreconditionerWrapper::num_rows() const {
   return matrix_->num_rows();
 }