diff --git a/test_utils/run_cnvgrib_tests.sh b/test_utils/run_cnvgrib_tests.sh
index 9d554cbf..9a7ded6a 100644
--- a/test_utils/run_cnvgrib_tests.sh
+++ b/test_utils/run_cnvgrib_tests.sh
@@ -17,6 +17,9 @@ echo "*** Running cnvgrib test"
 # Run with incorrect number of arguments
 ../utils/cnvgrib -g21 data/ref_gdaswave.t00z.wcoast.0p16.f000.grib2 && exit 2
 
+# Run with no -gxx option
+../utils/cnvgrib data/ref_gdaswave.t00z.wcoast.0p16.f000.grib2 test_gdaswave.t00z.wcoast.0p16.f000.grib1 && exit 2
+
 # Invalid master table version
 ../utils/cnvgrib -g21 -mastertable_ver_0 data/ref_gdaswave.t00z.wcoast.0p16.f000.grib2 test_gdaswave.t00z.wcoast.0p16.f000.grib1 && exit 2