diff --git a/src/constraint_imu.h b/src/constraint_imu.h
index 72deeb9a7af847f5ec43b39b99f1a6a1e76d4eab..c61d7d720eab1cf27e44d9d0639931e6dc3ce52c 100644
--- a/src/constraint_imu.h
+++ b/src/constraint_imu.h
@@ -270,7 +270,7 @@ inline bool ConstraintIMU::residual(const Eigen::MatrixBase<D1> &       _p1,
      *
      * NOTE: See optimization report at the end of this file for comparisons of both methods.
      */
-//#define METHOD_1 // if commented, then METHOD_2 will be applied
+#define METHOD_1 // if commented, then METHOD_2 will be applied
 
 
     //needed typedefs