diff --git a/internal/ceres/linear_solver.h b/internal/ceres/linear_solver.h
index 853abcb..31f8874 100644
--- a/internal/ceres/linear_solver.h
+++ b/internal/ceres/linear_solver.h
@@ -72,6 +72,7 @@
         : type(SPARSE_NORMAL_CHOLESKY),
           preconditioner_type(JACOBI),
           sparse_linear_algebra_library(SUITE_SPARSE),
+          use_block_amd(true),
           min_num_iterations(1),
           max_num_iterations(1),
           num_threads(1),
@@ -88,6 +89,9 @@
 
     SparseLinearAlgebraLibraryType sparse_linear_algebra_library;
 
+    // See solver.h for explanation of this option.
+    bool use_block_amd;
+
     // Number of internal iterations that the solver uses. This
     // parameter only makes sense for iterative solvers like CG.
     int min_num_iterations;