diff --git a/gtsam/slam/SmartProjectionFactor.h b/gtsam/slam/SmartProjectionFactor.h
index 7c137ad5c..1ee3fdb0b 100644
--- a/gtsam/slam/SmartProjectionFactor.h
+++ b/gtsam/slam/SmartProjectionFactor.h
@@ -52,6 +52,7 @@ public:
 private:
   typedef SmartFactorBase<CAMERA> Base;
   typedef SmartProjectionFactor<CAMERA> This;
+  typedef SmartProjectionFactor<CAMERA> SmartProjectionCameraFactor;
 
 protected: