diff --git a/plugins/network/arp_ b/plugins/network/arp_
index adbd86c3..471d17f3 100755
--- a/plugins/network/arp_
+++ b/plugins/network/arp_
@@ -15,7 +15,7 @@
 #%# family=contrib
 #%# capabilities=autoconf suggest
 
-INTERFACE=`basename $0 | sed 's/^arp_//g' | tr '_' '.'`
+INTERFACE=$(basename $0 | sed 's/^arp_//g' | tr '_' '.')
 
 if [ "$1" = "autoconf" ]; then
     # Search for arp
@@ -43,7 +43,7 @@ if [ "$1" = "config" ]; then
         echo 'graph_vlabel Entries'
         echo 'graph_category network'
 	echo 'graph_scale no'
-        echo "graph_info This graph shows the number of ARP entries registered by the system for interface $INTERFACE."
+        echo "graph_info This graph shows the number of ARP entries registered by the system for interface ${INTERFACE}."
 	echo 'entries.label ARP entries'
 	echo 'entries.draw LINE2'
 	echo 'entries.type GAUGE'
@@ -51,5 +51,5 @@ if [ "$1" = "config" ]; then
 	exit 0
 fi
 
-arp -an -i $INTERFACE | awk 'BEGIN { regex="<incomplete>";} { if (!match($4,regex)) { a[$4] }} END{for(i in a){n++};print "entries.value " n}'
+arp -an -i "$INTERFACE" | awk 'BEGIN { regex="<incomplete>";} { if (!match($4,regex)) { a[$4] }} END{for(i in a){n++};print "entries.value " n}'