diff --git a/plugins/Full_CI_ZMQ/selection_slave.irp.f b/plugins/Full_CI_ZMQ/selection_slave.irp.f
index 2aba32fe..31f42e7e 100644
--- a/plugins/Full_CI_ZMQ/selection_slave.irp.f
+++ b/plugins/Full_CI_ZMQ/selection_slave.irp.f
@@ -64,10 +64,10 @@ subroutine run_wf
       print *,  'Davidson'
       call davidson_miniserver_get()
 
-      !$OMP PARALLEL PRIVATE(i)
-      i = omp_get_thread_num()
-      call davidson_slave_tcp(i)
-      !$OMP END PARALLEL
+      !!$OMP PARALLEL PRIVATE(i)
+      !i = omp_get_thread_num()
+      call davidson_slave_tcp(0)
+      !!$OMP END PARALLEL
       print *,  'Davidson done'
 
     endif