diff --git a/src/mo_optimization/EZFIO.cfg b/src/mo_optimization/EZFIO.cfg
index 8944e507..e6aa2d67 100644
--- a/src/mo_optimization/EZFIO.cfg
+++ b/src/mo_optimization/EZFIO.cfg
@@ -4,12 +4,6 @@ doc: Define the kind of hessian for the orbital optimization full : full hessian
 interface: ezfio,provider,ocaml
 default: full
 
-[n_det_start]
-type: integer
-doc: Number of determinants after which the orbital optimization will start, n_det_start must be greater than 1. The algorithm does a cipsi until n_det > n_det_start and the optimization starts after
-interface: ezfio,provider,ocaml
-default: 5
-
 [n_det_max_opt]
 type: integer
 doc: Maximal number of the determinants in the wf for the orbital optimization (to stop the optimization if n_det > n_det_max_opt)