1 files changed, 3 insertions, 1 deletions
diff --git a/extern/ceres/internal/ceres/dynamic_compressed_row_sparse_matrix.h b/extern/ceres/internal/ceres/dynamic_compressed_row_sparse_matrix.h
index ad41da7b15a..d06c36ebb94 100644
--- a/extern/ceres/internal/ceres/dynamic_compressed_row_sparse_matrix.h
+++ b/extern/ceres/internal/ceres/dynamic_compressed_row_sparse_matrix.h
@@ -44,11 +44,13 @@
 #include <vector>
 
 #include "ceres/compressed_row_sparse_matrix.h"
+#include "ceres/internal/port.h"
 
 namespace ceres {
 namespace internal {
 
-class DynamicCompressedRowSparseMatrix : public CompressedRowSparseMatrix {
+class CERES_EXPORT_INTERNAL DynamicCompressedRowSparseMatrix
+    : public CompressedRowSparseMatrix {
  public:
   // Set the number of rows and columns for the underlyig
   // `CompressedRowSparseMatrix` and set the initial number of maximum non-zero