diff --git a/include/IMU/factor/factor_IMU.h b/include/IMU/factor/factor_IMU.h
index f5715095b8e8eab5d00b3ce85e45b8bb97e3c8ea..60c94a9288d45d337d61280dc8d4d007cfa53101 100644
--- a/include/IMU/factor/factor_IMU.h
+++ b/include/IMU/factor/factor_IMU.h
@@ -147,6 +147,8 @@ class FactorIMU : public FactorAutodiff<FactorIMU, 15, 3, 4, 3, 6, 3, 4, 3, 6>
         const Eigen::Matrix3d sqrt_A_r_dt_inv;
         const Eigen::Matrix3d sqrt_W_r_dt_inv;
 
+    public:
+      EIGEN_MAKE_ALIGNED_OPERATOR_NEW;
 };
 
 ///////////////////// IMPLEMENTAITON ////////////////////////////