diff --git a/tests/grib_change_packing.sh b/tests/grib_change_packing.sh
index 4624ca003..8a530eb83 100755
--- a/tests/grib_change_packing.sh
+++ b/tests/grib_change_packing.sh
@@ -28,7 +28,7 @@ rm -f $temp
 # --- test changing the packing
 # arg 1    : input grib file
 # arg 2-n  : packing types to test
-function test_packing() {
+test_packing() {
     grib=$1
 
     if [ ! -f $grib ]; then