diff --git a/tests/grib_check_gaussian_grids.sh b/tests/grib_check_gaussian_grids.sh
index 21d639291..3abf03942 100755
--- a/tests/grib_check_gaussian_grids.sh
+++ b/tests/grib_check_gaussian_grids.sh
@@ -112,7 +112,7 @@ set -e
 [ $status -eq 1 ]
 
 ${tools_dir}/grib_check_gaussian_grid -v $data_dir > $tempText
-grep -q "not a regular file" $tempText
+grep -q "is a directory" $tempText
 
 ${tools_dir}/grib_check_gaussian_grid -v $ECCODES_SAMPLES_PATH/GRIB2.tmpl > $tempText
 grep -q "ignoring" $tempText
diff --git a/tools/grib_check_gaussian_grid.cc b/tools/grib_check_gaussian_grid.cc
index 9fb0ddc9b..666658490 100644
--- a/tools/grib_check_gaussian_grid.cc
+++ b/tools/grib_check_gaussian_grid.cc
@@ -69,9 +69,9 @@ static int process_file(const char* filename)
     grib_handle* h = NULL;
     FILE* in       = NULL;
 
-    if (!path_is_regular_file(filename)) {
+    if (path_is_directory(filename)) {
         if (verbose)
-            printf(" WARNING: '%s' not a regular file! Ignoring\n", filename);
+            printf(" WARNING: '%s' is a directory! Ignoring\n", filename);
         return GRIB_IO_PROBLEM;
     }