diff --git a/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf b/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf
index f743c0313..47bdf467e 100644
--- a/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf
+++ b/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf
@@ -94,7 +94,7 @@ TC_DIAG_DECK_INPUT_TEMPLATE = subset.a{TC_DIAG_BASIN_LOWER}{TC_DIAG_CYCLONE}{dat
 
 TC_DIAG_INPUT1_DIR = {INPUT_BASE}/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast/model_data/grib2/gfs/
 #TC_DIAG_INPUT1_TEMPLATE = model_data/grib2/gfs/subset.gfs.0p25.t12z.pgrb2.0p25.f*
-TC_DIAG_INPUT1_TEMPLATE = subset.gfs.0p25.{init?fmt=%Y%m%d%H}.f00begin_end_incr(0,6,6)
+TC_DIAG_INPUT1_TEMPLATE = subset.gfs.0p25.{init?fmt=%Y%m%d%H}.f00begin_end_incr(0,6,6).grib2
 #GEN_ENS_PROD_INPUT_TEMPLATE = hrrrebegin_end_incr(1,3,1,2)_{init?fmt=%Y%m%d%H}f{lead?fmt=%HHH}_A03.nc
 
 TC_DIAG_INPUT1_DOMAIN = parent