diff --git a/src/Applications/NCEP_Etc/NCEP_enkf/scripts/gmao/etc/R21C/HISTAENS.rc.tmpl b/src/Applications/NCEP_Etc/NCEP_enkf/scripts/gmao/etc/R21C/HISTAENS.rc.tmpl
index c2a85787..4321fa6b 100644
--- a/src/Applications/NCEP_Etc/NCEP_enkf/scripts/gmao/etc/R21C/HISTAENS.rc.tmpl
+++ b/src/Applications/NCEP_Etc/NCEP_enkf/scripts/gmao/etc/R21C/HISTAENS.rc.tmpl
@@ -5,6 +5,7 @@
 VERSION: 1
 EXPID:  >>>EXPID<<<
 EXPDSC: ensemble_bkg
+Allow_Overwrite: .true.
  
 GRID_LABELS: PC288x181-DC
 	     PE90x540-CF