1 files changed, 3 insertions, 1 deletions
diff --git a/extern/ceres/internal/ceres/block_random_access_matrix.h b/extern/ceres/internal/ceres/block_random_access_matrix.h
index 6fcf0dc8a7c..f190622eafe 100644
--- a/extern/ceres/internal/ceres/block_random_access_matrix.h
+++ b/extern/ceres/internal/ceres/block_random_access_matrix.h
@@ -35,6 +35,8 @@
 
 #include <mutex>
 
+#include "ceres/internal/port.h"
+
 namespace ceres {
 namespace internal {
 
@@ -91,7 +93,7 @@ struct CellInfo {
   std::mutex m;
 };
 
-class BlockRandomAccessMatrix {
+class CERES_EXPORT_INTERNAL BlockRandomAccessMatrix {
  public:
   virtual ~BlockRandomAccessMatrix();