diff --git a/tests/concept.sh b/tests/concept.sh
index 71ee67fec..09d16c4fd 100755
--- a/tests/concept.sh
+++ b/tests/concept.sh
@@ -10,19 +10,77 @@
 
 . ./include.sh
 
-data="${data_dir}/*grib1 ${data_dir}/*grib2"
+# data="${data_dir}/*grib1 ${data_dir}/*grib2"
+data="
+constant_field.grib1
+lfpw.grib1
+missing_field.grib1
+reduced_gaussian_lsm.grib1
+reduced_gaussian_model_level.grib1
+reduced_gaussian_pressure_level.grib1
+reduced_gaussian_pressure_level_constant.grib1
+reduced_gaussian_sub_area.grib1
+reduced_gaussian_surface.grib1
+reduced_latlon_surface.grib1
+reduced_latlon_surface_constant.grib1
+reference_ensemble_mean.grib1
+reference_stdev.grib1
+regular_gaussian_model_level.grib1
+regular_gaussian_pressure_level.grib1
+regular_gaussian_pressure_level_constant.grib1
+regular_gaussian_surface.grib1
+regular_latlon_surface.grib1
+regular_latlon_surface_constant.grib1
+second_ord_rbr.grib1
+small_ensemble.grib1
+spectral_compex.grib1
+spectral_complex.grib1
+spherical_model_level.grib1
+spherical_pressure_level.grib1
+test.grib1
+
+constant_field.grib2
+gfs.c255.grib2
+jpeg.grib2
+missing.grib2
+multi.grib2
+multi_created.grib2
+reduced_gaussian_model_level.grib2
+reduced_gaussian_pressure_level.grib2
+reduced_gaussian_pressure_level_constant.grib2
+reduced_gaussian_sub_area.grib2
+reduced_gaussian_surface.grib2
+reduced_gaussian_surface_jpeg.grib2
+reduced_latlon_surface.grib2
+reduced_latlon_surface_constant.grib2
+regular_gaussian_model_level.grib2
+regular_gaussian_pressure_level.grib2
+regular_gaussian_pressure_level_constant.grib2
+regular_gaussian_surface.grib2
+regular_latlon_surface.grib2
+regular_latlon_surface_constant.grib2
+sample.grib2
+spherical_model_level.grib2
+spherical_pressure_level.grib2
+test_uuid.grib2
+tigge_af_ecmwf.grib2
+tigge_cf_ecmwf.grib2
+tigge_ecmwf.grib2
+tigge_pf_ecmwf.grib2
+v.grib2
+"
+
 tmp="tmp.concept.out"
 
 for d in $data
 do
   set -e
-  ${tools_dir}grib_ls -p gridType,packingType -w dataRepresentationType!=192 $d > $tmp
+  ${tools_dir}grib_ls -p gridType,packingType -w dataRepresentationType!=192 ${data_dir}/$d > $tmp
  
   set +e
   grep unknown $tmp
  
-  if [ $? -eq 0 ] 
-  then 
+  if [ $? -eq 0 ]; then 
     false
     exit
   fi