diff --git a/resources/provision.sh b/resources/provision.sh
index 1b90b2f..80c86e7 100755
--- a/resources/provision.sh
+++ b/resources/provision.sh
@@ -92,8 +92,17 @@ upstream_pkg_site_available() {
 }
 
 bootstrap_pkg() {
+  if [ -e /dev/iso9660 ]; then
+    local device_path=/dev/iso9660
+  elif [ -e /dev/cd0 ]; then
+    local device_path=/dev/cd0
+  else
+    echo "ERROR: There is no DVD/CDROM device available to mount" >&2
+    exit 1
+  fi
+
   sed -i '' 's/signature_type: "fingerprints"/signature_type: "none"/' /etc/pkg/FreeBSD.conf
-  mount -t cd9660 /dev/cd0 /mnt
+  mount -t cd9660 "$device_path" /mnt
   export PACKAGESITE="file:///mnt/packages/FreeBSD:$ABI_VERSION:$PKG_SITE_ARCHITECTURE"
   ASSUME_ALWAYS_YES=yes pkg bootstrap
 }