diff --git a/gtsam/navigation/AttitudeFactor.h b/gtsam/navigation/AttitudeFactor.h
index 44dd4183a..64603bd99 100644
--- a/gtsam/navigation/AttitudeFactor.h
+++ b/gtsam/navigation/AttitudeFactor.h
@@ -61,7 +61,7 @@ public:
  * Version of AttitudeFactor for Rot3
  * @addtogroup Navigation
  */
-class Rot3AttitudeFactor: public NoiseModelFactor1<Rot3>, public AttitudeFactor {
+class GTSAM_EXPORT Rot3AttitudeFactor: public NoiseModelFactor1<Rot3>, public AttitudeFactor {
 
   typedef NoiseModelFactor1<Rot3> Base;
 
@@ -129,7 +129,7 @@ private:
  * Version of AttitudeFactor for Pose3
  * @addtogroup Navigation
  */
-class Pose3AttitudeFactor: public NoiseModelFactor1<Pose3>,
+class GTSAM_EXPORT Pose3AttitudeFactor: public NoiseModelFactor1<Pose3>,
     public AttitudeFactor {
 
   typedef NoiseModelFactor1<Pose3> Base;