diff --git a/tests/gts_get.sh b/tests/gts_get.sh
index b61751dcf..0bea9b259 100755
--- a/tests/gts_get.sh
+++ b/tests/gts_get.sh
@@ -13,14 +13,11 @@
 #Enter data dir
 cd ${data_dir}/gts
 
-#Define a common label for all the tmp files
 label="gts_get_test"
 
-#Create log file
 fLog=${label}".log"
 rm -f $fLog
 
-#Define tmp file
 fTmp=${label}".tmp.txt"
 
 #----------------------------------------------
@@ -35,5 +32,20 @@ result=$( ${tools_dir}/grib_get -wcount=1 -p gts_CCCC -g $gts_file )
 
 ${tools_dir}/grib_get -wcount=1 -p gts_header -g $gts_file
 
+# Encoding should be disabled
+# -----------------------------
+set +e
+${tools_dir}/grib_set -s gts_CCCC=xxx -g $gts_file $fTmp
+status=$?
+set -e
+[ $status -ne 0 ]
 
-rm -f $fLog
+set +e
+${tools_dir}/grib_set -s gts_header=yyy -g $gts_file $fTmp
+status=$?
+set -e
+[ $status -ne 0 ]
+
+
+# Clean up
+rm -f $fLog $fTmp