diff --git a/plugins/lxc/lxc-multigraph b/plugins/lxc/lxc-multigraph
index f97f925f..0becc68e 100755
--- a/plugins/lxc/lxc-multigraph
+++ b/plugins/lxc/lxc-multigraph
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # -*- sh -*-
 
 : << =cut
@@ -94,7 +94,7 @@ cgrouppath=${cgrouppath:-}
 
 # --- FUNCTIONS
 
-function active_guests {
+active_guests() {
    local excludes="$1"
    local guest_name
    for guest_name in $(lxc-ls)
@@ -109,7 +109,7 @@ function active_guests {
 }
 
 
-function get_lxc_cgroup_info {
+get_lxc_cgroup_info() {
    local guest_name="$1"
    local field="$2"
    # lxc3 (lxc < 3: may output some warnings if there is cruft in your config dir)
@@ -117,7 +117,7 @@ function get_lxc_cgroup_info {
 }
 
 
-function lxc_netdev {
+lxc_netdev() {
    local guest_name="$1"
 
    if [ -f "$lxcpath/$guest_name/config" ]; then