diff --git a/gtsam/nonlinear/NonlinearOptimizer-inl.h b/gtsam/nonlinear/NonlinearOptimizer-inl.h
index 4ce2a6115..18ffa4044 100644
--- a/gtsam/nonlinear/NonlinearOptimizer-inl.h
+++ b/gtsam/nonlinear/NonlinearOptimizer-inl.h
@@ -159,7 +159,7 @@ namespace gtsam {
 		      Matrix A = eye(dim);
 		      Vector b = zero(dim);
 		      SharedDiagonal model = noiseModel::Isotropic::Sigma(dim,sigma);
-		      GaussianFactor::shared_ptr prior(new JacobianFactor(j, A, b, model));
+		      typename L::sharedFactor prior(new JacobianFactor(j, A, b, model));
 		      damped->push_back(prior);
 		    }
 		  }