diff --git a/plugins/Full_CI_ZMQ/fci_zmq.irp.f b/plugins/Full_CI_ZMQ/fci_zmq.irp.f
index aa0c013e..e221533b 100644
--- a/plugins/Full_CI_ZMQ/fci_zmq.irp.f
+++ b/plugins/Full_CI_ZMQ/fci_zmq.irp.f
@@ -128,7 +128,7 @@ subroutine ZMQ_selection(N, pt2)
   integer                        :: i
   integer, external              :: omp_get_thread_num
   double precision, intent(out)  :: pt2(N_states)
-  
+  call flip_generators()
   call new_parallel_job(zmq_to_qp_run_socket,'selection')
   
   call create_selection_buffer(N, N*2, b)
@@ -149,6 +149,7 @@ subroutine ZMQ_selection(N, pt2)
       endif
   !$OMP END PARALLEL
   call end_parallel_job(zmq_to_qp_run_socket, 'selection') 
+  call flip_generators()
   call fill_H_apply_buffer_no_selection(b%cur,b%det,N_int,0) !!! PAS DE ROBIN
   call copy_H_apply_buffer_to_wf()
 end subroutine
diff --git a/plugins/Full_CI_ZMQ/selection.irp.f b/plugins/Full_CI_ZMQ/selection.irp.f
index 74149345..5e4eef36 100644
--- a/plugins/Full_CI_ZMQ/selection.irp.f
+++ b/plugins/Full_CI_ZMQ/selection.irp.f
@@ -28,7 +28,6 @@ subroutine selection_slave(thread,iproc)
   buf%N = 0
   ctask = 1
   pt2 = 0d0
-  
   do 
     call get_task_from_taskserver(zmq_to_qp_run_socket,worker_id, task_id(ctask), task)
     done = task_id(ctask) == 0
diff --git a/src/Determinants/determinants.irp.f b/src/Determinants/determinants.irp.f
index 400345c1..609379f2 100644
--- a/src/Determinants/determinants.irp.f
+++ b/src/Determinants/determinants.irp.f
@@ -330,6 +330,24 @@ END_PROVIDER
 
 END_PROVIDER
 
+subroutine flip_generators()
+  integer :: i,j,k
+  integer(bit_kind) :: detmp(N_int,2)
+  double precision :: tmp(N_states)
+  
+  do i=1,N_det_generators/2
+    detmp(:,:) = psi_det_sorted(:,:,i)
+    tmp = psi_coef_sorted(i, :)
+    psi_det_sorted(:,:,i) = psi_det_sorted(:,:,N_det_generators+1-i)
+    psi_coef_sorted(i, :) = psi_coef_sorted(N_det_generators+1-i, :)
+    
+    psi_det_sorted(:,:,N_det_generators+1-i) = detmp(:,:)
+    psi_coef_sorted(N_det_generators+1-i, :) = tmp
+  end do
+  
+  TOUCH psi_det_sorted psi_coef_sorted psi_average_norm_contrib_sorted
+end subroutine
+
  BEGIN_PROVIDER [ integer(bit_kind), psi_det_sorted_bit, (N_int,2,psi_det_size) ]
 &BEGIN_PROVIDER [ double precision, psi_coef_sorted_bit, (psi_det_size,N_states) ]
  implicit none