diff --git a/regression/global_enkf.sh b/regression/global_enkf.sh
index af157abc5..f5b4f3d1c 100755
--- a/regression/global_enkf.sh
+++ b/regression/global_enkf.sh
@@ -76,14 +76,11 @@ export use_correlated_oberrs=${use_correlated_oberrs:-".false."}
 if [ $USE_CORRELATED_OBERRS == "YES" ]; then
     export use_correlated_oberrs=".true."
 fi
-export imp_physics=${imp_physics:-"8"}
 export lupp=${lupp:-".true."}
 export corrlength=${corrlength:-1250}
 export lnsigcutoff=${lnsigcutoff:-2.75}
 export analpertwt=${analpertwt:-0.85}
 export readin_localization_enkf=".false."
-export readin_localization_enkf=${readin_localization_enkf:-".false."}
-export reducedgrid=${reducedgrid:-".false."}
 export letkf_flag=${letkf_flag:-".true."}
 export getkf=${getkf:-".true."}
 export denkf=${denkf:-".true."}
diff --git a/regression/regression_namelists.sh b/regression/regression_namelists.sh
index a15b15ad1..a6bd78994 100755
--- a/regression/regression_namelists.sh
+++ b/regression/regression_namelists.sh
@@ -963,7 +963,7 @@ export gsi_namelist="
   nlons=$LONA,nlats=$LATA,nlevs=$LEVS,nanals=$NMEM_ENKF,
   deterministic=.true.,sortinc=.true.,lupd_satbiasc=.false.,
   reducedgrid=.false.,readin_localization=.false.,
-  use_gfs_nemsio=${use_gfs_nemsio},use_gfs_ncio=${use_gfs_ncio},imp_physics=$imp_physics,lupp=$lupp,
+  use_gfs_nemsio=${use_gfs_nemsio},use_gfs_ncio=${use_gfs_ncio},imp_physics=8,lupp=$lupp,
   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},