diff --git a/plugins/network/vnstat_ b/plugins/network/vnstat_
index f88ad8c1..9fb9c039 100755
--- a/plugins/network/vnstat_
+++ b/plugins/network/vnstat_
@@ -16,7 +16,7 @@
 
 
 
-IFACE=`echo $0 | awk -F_ '{print $1}'`
+IFACE=${0##*vnstat_}
 
 
 # Config section