diff --git a/gtsam/nonlinear/GncOptimizer.h b/gtsam/nonlinear/GncOptimizer.h
index eb1c0233f..065278573 100644
--- a/gtsam/nonlinear/GncOptimizer.h
+++ b/gtsam/nonlinear/GncOptimizer.h
@@ -42,7 +42,7 @@ static double Chi2inv(const double alpha, const size_t dofs) {
 
 /* ************************************************************************* */
 template<class GncParameters>
-class GTSAM_EXPORT GncOptimizer {
+class GncOptimizer {
  public:
   /// For each parameter, specify the corresponding optimizer: e.g., GaussNewtonParams -> GaussNewtonOptimizer.
   typedef typename GncParameters::OptimizerType BaseOptimizer;
diff --git a/gtsam/nonlinear/GncParams.h b/gtsam/nonlinear/GncParams.h
index e069d5f3d..10ac80663 100644
--- a/gtsam/nonlinear/GncParams.h
+++ b/gtsam/nonlinear/GncParams.h
@@ -39,7 +39,7 @@ enum GncLossType {
 };
 
 template<class BaseOptimizerParameters>
-class GTSAM_EXPORT GncParams {
+class GncParams {
  public:
   /// For each parameter, specify the corresponding optimizer: e.g., GaussNewtonParams -> GaussNewtonOptimizer.
   typedef typename BaseOptimizerParameters::OptimizerType OptimizerType;