diff --git a/internal/ceres/linear_least_squares_problems.h b/internal/ceres/linear_least_squares_problems.h
index 553cc0d..c76ae91 100644
--- a/internal/ceres/linear_least_squares_problems.h
+++ b/internal/ceres/linear_least_squares_problems.h
@@ -74,7 +74,7 @@
 // Write the linear least squares problem to disk. The exact format
 // depends on dump_format_type.
 bool DumpLinearLeastSquaresProblem(const string& directory,
-                              	   int iteration,
+                                   int iteration,
                                    DumpFormatType dump_format_type,
                                    const SparseMatrix* A,
                                    const double* D,