diff --git a/internal/ceres/iterative_refiner.cc b/internal/ceres/iterative_refiner.cc
index fb0e45b..5f0bfdd 100644
--- a/internal/ceres/iterative_refiner.cc
+++ b/internal/ceres/iterative_refiner.cc
@@ -28,9 +28,10 @@
 //
 // Author: sameeragarwal@google.com (Sameer Agarwal)
 
-#include <string>
 #include "ceres/iterative_refiner.h"
 
+#include <string>
+
 #include "Eigen/Core"
 #include "ceres/sparse_cholesky.h"
 #include "ceres/sparse_matrix.h"