diff --git a/plugins/lxc/lxc-multigraph b/plugins/lxc/lxc-multigraph
index 220e7bb4..417a42e5 100755
--- a/plugins/lxc/lxc-multigraph
+++ b/plugins/lxc/lxc-multigraph
@@ -171,7 +171,7 @@ lxc_count_processes () {
 
 # --- BASIC DEFINES
 
-active_guests=$(active_guests $exclude)
+active_guests=$(active_guests "$exclude")
 
 # --- AUTOCONF