1 files changed, 2 insertions, 1 deletions
diff --git a/extern/ceres/internal/ceres/trust_region_strategy.h b/extern/ceres/internal/ceres/trust_region_strategy.h
index 5751691e5ec..176f73a4876 100644
--- a/extern/ceres/internal/ceres/trust_region_strategy.h
+++ b/extern/ceres/internal/ceres/trust_region_strategy.h
@@ -32,6 +32,7 @@
 #define CERES_INTERNAL_TRUST_REGION_STRATEGY_H_
 
 #include <string>
+
 #include "ceres/internal/port.h"
 #include "ceres/linear_solver.h"
 
@@ -53,7 +54,7 @@ class SparseMatrix;
 // the LevenbergMarquardtStrategy uses the inverse of the trust region
 // radius to scale the damping term, which controls the step size, but
 // does not set a hard limit on its size.
-class TrustRegionStrategy {
+class CERES_EXPORT_INTERNAL TrustRegionStrategy {
  public:
   struct Options {
     TrustRegionStrategyType trust_region_strategy_type = LEVENBERG_MARQUARDT;