diff --git a/internal/ceres/compressed_row_sparse_matrix_test.cc b/internal/ceres/compressed_row_sparse_matrix_test.cc
index 46136db..5beabd8 100644
--- a/internal/ceres/compressed_row_sparse_matrix_test.cc
+++ b/internal/ceres/compressed_row_sparse_matrix_test.cc
@@ -253,9 +253,9 @@
 
 TEST(CompressedRowSparseMatrix, Transpose) {
   //  0  1  0  2  3  0
-  //  4  6  7  0  0  8
-  //  9 10  0 11 12  0
-  // 13  0 14 15  9  0
+  //  4  5  6  0  0  7
+  //  8  9  0 10 11  0
+  // 12  0 13 14 15  0
   //  0 16 17  0  0  0
 
   // Block structure:
@@ -303,7 +303,7 @@
   cols[16] = 2;
   rows[5] = 17;
 
-  std::copy(values, values + 17, cols);
+  std::iota(values, values + 17, 1);
 
   auto transpose = matrix.Transpose();