diff --git a/openup b/openup
index 00c2906..2f034ee 100755
--- a/openup
+++ b/openup
@@ -35,6 +35,8 @@ PKG_PATH_UPDATE="https://stable.mtier.org/updates/$(uname -r)/$(arch -s)"
 #PKG_PATH_UPDATE_LTS="https://user%domain.tld:password@stable.mtier.org/updates-lts/$(uname -r)/$(arch -s)"
 # URL to the latest vuxml (vulnerabilities database)
 VUXML_URL="https://stable.mtier.org/vuxml/$(uname -r | tr -d '.').xml"
+# fetch command (must behave like "ftp -o"); e.g. "wget -O"
+FETCH="ftp -Vo"
 # exclusion list: pkg names without version/flavor, separated by space
 EXCLUDE_PKG=""
 ########################################################################
@@ -72,7 +74,7 @@ get_key() {
 	[ -r /etc/signify/mtier-${_REL_INT}-pkg.pub ] && return
 
 	pr "Downloading and installing public key"
-	ftp -Vo ${_TMPKEY} ${PKG_PUBKEY_URL} || bye_bye
+	${FETCH} ${_TMPKEY} ${PKG_PUBKEY_URL} || bye_bye
 	install -m0644 ${_TMPKEY} /etc/signify/mtier-${_REL_INT}-pkg.pub || bye_bye
 }
 
@@ -80,7 +82,7 @@ check_openupd() {
 	local _U
 
 	pr "Checking for openup update"
-	_U="ftp -Vo - ${OPENUP_URL} | awk -F '=' '/^_OPENUP_VERSION/ { print \$2 }'"
+	_U="${FETCH} - ${OPENUP_URL} | awk -F '=' '/^_OPENUP_VERSION/ { print \$2 }'"
 	_U=$(eval $_U)
 	if [ -z "${_U}" ]; then
 		pr_err "Cannot retrieve ${OPENUP_URL}"
@@ -90,7 +92,7 @@ check_openupd() {
 
 	if [ "${_OPENUP_VERSION}" -lt "${_U}" ]; then
 		pr_err "New openup release (version ${_U}) available; please update with:"
-		pr_err "ftp -Vo $(readlink -f $0) ${OPENUP_URL}"
+		pr_err "${FETCH} $(readlink -f $0) ${OPENUP_URL}"
 		bye_bye
 	fi
 }
@@ -153,7 +155,7 @@ update_pkg() {
 check_vuxml() {
 	local _BP_MATCH _OUTDATED _PKG_MATCH _b _e _p
 
-	ftp -Vo ${_TMPVUXML} ${VUXML_URL} >/dev/null || bye_bye
+	${FETCH} ${_TMPVUXML} ${VUXML_URL} >/dev/null || bye_bye
 	perl -pi -e 's,\$ARCH,'"${_ARCH}"',g' ${_TMPVUXML}
 
 	_BP_MATCH="$(grep binpatch ${_TMPVUXML} | sed -e 's,<name>,,g;s,</name>,,g;s,\$ARCH,'"${_ARCH}"',g' | sort -u)"