diff --git a/plugins/virtualization/xen_traffic_all b/plugins/virtualization/xen_traffic_all
index c090ee09..b1368739 100755
--- a/plugins/virtualization/xen_traffic_all
+++ b/plugins/virtualization/xen_traffic_all
@@ -51,7 +51,7 @@ fi
 DOMAINS=$(xm list | awk '{print $1}' | egrep -v "^(Name|Domain-0)")
 for dom in $DOMAINS; do
 		dev=$( xm list $dom --long | awk '/vifname / { print $2 }' | sed 's/)//' )
-		if [ "$dev" == "" ]; then
+		if [ "$dev" = "" ]; then
 	    dev=$( xm network-list $dom |\
 	        egrep "^[0-9]+" | sed 's@^.*vif/\([0-9]*\)/\([0-9]*\).*$@vif\1.\2@')
 		fi