diff --git a/ush/forecast_postdet.sh b/ush/forecast_postdet.sh
index a5fee9a7fd..c9229d436e 100755
--- a/ush/forecast_postdet.sh
+++ b/ush/forecast_postdet.sh
@@ -249,10 +249,15 @@ EOF
     ${NLN} "${FIXgfs}/lut/optics_SU.v1_3.dat"  "${DATA}/optics_SU.dat"
   fi
 
+  co2dir="fix_co2_proj"
+  if [[ ${reforecast:-"NO"} = "YES" | ]]; then 
+   co2dir="co2dat_4a"
+  fi
+
   ${NLN} "${FIXgfs}/am/global_co2historicaldata_glob.txt" "${DATA}/co2historicaldata_glob.txt"
   ${NLN} "${FIXgfs}/am/co2monthlycyc.txt"                 "${DATA}/co2monthlycyc.txt"
   if [[ ${ICO2} -gt 0 ]]; then
-    for file in $(ls "${FIXgfs}/am/fix_co2_proj/global_co2historicaldata"*) ; do
+    for file in $(ls "${FIXgfs}/am/${co2dir}/global_co2historicaldata"*) ; do
       ${NLN} "${file}" "${DATA}/$(basename "${file//global_}")"
     done
   fi