diff --git a/cluster/maco.check.update.sh b/cluster/maco.check.update.sh
index b095332..b851980 100755
--- a/cluster/maco.check.update.sh
+++ b/cluster/maco.check.update.sh
@@ -225,7 +225,7 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 
 	manage_arg="0"
 	# Parse all options (start with a "-") one by one
-	while printf -- '%s' "${1}" | grep -q -E -- "^-*"; do
+	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
 
 	case "${1}" in
 		-h|--help ) ## help
diff --git a/cluster/sge.enable.host.queue.sh b/cluster/sge.enable.host.queue.sh
index b31ea85..37e3d17 100755
--- a/cluster/sge.enable.host.queue.sh
+++ b/cluster/sge.enable.host.queue.sh
@@ -320,7 +320,7 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 	manage_arg="0"
 
 	## If the first argument is not an option
-	if ! printf -- '%s' "${1}" | grep -q -E -- "^-*";
+	if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
 	then
 		## Use this argument for sge_hostname
 		sge_hostname="${1}"
@@ -337,7 +337,7 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 	fi
 
 	# Parse all options (start with a "-") one by one
-	while printf -- '%s' "${1}" | grep -q -E -- "^-*"; do
+	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
 
 	case "${1}" in
 		-d|--debug )           ## debug