diff --git a/src/oce_ale_tracer.F90 b/src/oce_ale_tracer.F90
index a7bd52f26..06b157752 100644
--- a/src/oce_ale_tracer.F90
+++ b/src/oce_ale_tracer.F90
@@ -148,10 +148,8 @@ subroutine solve_tracers_ale(mesh)
         call diff_tracers_ale(tr_num, mesh)
 
 !       Radioactive decay of 14C and 39Ar
-!!      if (tracer_id(tr_num) == 14) tr_arr(:,:,tr_num) = tr_arr(:,:,tr_num) * exp(-decay14 * dt)
-        if (tracer_id(tr_num) == 14) tr_arr(:,:,tr_num) = tr_arr(:,:,tr_num) * (1. - decay14 * dt)
-!!      if (tracer_id(tr_num) == 39) tr_arr(:,:,tr_num) = tr_arr(:,:,tr_num) * exp(-decay39 * dt)
-        if (tracer_id(tr_num) == 39) tr_arr(:,:,tr_num) = tr_arr(:,:,tr_num) * (1. - decay39 * dt)
+        if (tracer_id(tr_num) == 14) tr_arr(:,:,tr_num) = tr_arr(:,:,tr_num) * exp(-decay14 * dt)
+        if (tracer_id(tr_num) == 39) tr_arr(:,:,tr_num) = tr_arr(:,:,tr_num) * exp(-decay39 * dt)
 
         ! relax to salt and temp climatology
         if (flag_debug .and. mype==0)  print *, achar(27)//'[37m'//'         --> call relax_to_clim'//achar(27)//'[0m'