diff --git a/regression/global_enkf.sh b/regression/global_enkf.sh
index f5b4f3d1c..bee24bf3e 100755
--- a/regression/global_enkf.sh
+++ b/regression/global_enkf.sh
@@ -90,6 +90,7 @@ export write_spread_diag=${write_spread_diag:-".false."}
 export cnvw_option=${cnvw_option:-".false."}
 export netcdf_diag=${netcdf_diag:-".true."}
 export modelspace_vloc=${modelspace_vloc:-".true."} # if true, 'vlocal_eig.dat' is needed
+export taperanalperts=${taperanalperts:-".true."}
 export IAUFHRS_ENKF=${IAUFHRS_ENKF:-'3,6,9'}
 export DO_CALC_INCREMENT=${DO_CALC_INCREMENT:-"NO"}
 export INCREMENTS_TO_ZERO="'liq_wat_inc','icmr_inc','rwmr_inc','snmr_inc','grle_inc'"
diff --git a/regression/regression_namelists.sh b/regression/regression_namelists.sh
index a6bd78994..18eded8bc 100755
--- a/regression/regression_namelists.sh
+++ b/regression/regression_namelists.sh
@@ -967,7 +967,7 @@ export gsi_namelist="
   univaroz=.false.,adp_anglebc=.true.,angord=4,use_edges=.false.,emiss_bc=.true.,
   letkf_flag=${letkf_flag},nobsl_max=${nobsl_max},denkf=${denkf},getkf=${getkf}.,
   nhr_anal=${IAUFHRS_ENKF},nhr_state=${IAUFHRS_ENKF},
-  lobsdiag_forenkf=$lobsdiag_forenkf,
+  lobsdiag_forenkf=$lobsdiag_forenkf,taperanalperts=${taperanalperts},
   write_spread_diag=$write_spread_diag,
   modelspace_vloc=$modelspace_vloc,
   use_correlated_oberrs=${use_correlated_oberrs},