diff --git a/debian/changelog b/debian/changelog
index 605e867f..b6850c4b 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -14,6 +14,9 @@ byobu (5.2) unreleased; urgency=low
   * usr/bin/Makefile.am, usr/lib/byobu/include/Makefile.am,
     usr/share/man/man1/Makefile.am:
     - install the byobu-layout tool and manpage
+  * usr/lib/byobu/ec2_cost, usr/lib/byobu/network:
+    - use /proc/net/dev for network transfer calculations
+    - fixes issue with ifconfig format changes
 
  -- Dustin Kirkland <kirkland@ubuntu.com>  Thu, 29 Dec 2011 12:28:51 -0600
 
diff --git a/usr/lib/byobu/ec2_cost b/usr/lib/byobu/ec2_cost
index ed24a550..b14a53c2 100755
--- a/usr/lib/byobu/ec2_cost
+++ b/usr/lib/byobu/ec2_cost
@@ -74,12 +74,16 @@ __ec2_cost() {
 	hours=$(((`date +%s` - `stat --printf %Y $file_to_stat`) / 60 / 60 + 1))
 	# Auto detect network interface
 	interface=`tail -n1 /proc/net/route  | awk '{print $1}'`
-	ifconfig_out=`LC_ALL=C /sbin/ifconfig "$interface"`
-	# Calculate bandwidth cost
-	tx_gb=${ifconfig_out#*RX bytes:}
-	tx_gb=$(echo ${tx_gb%% *} | awk '{ printf "%f", $1 / 1024 / 1024 / 1024 }')
-	rx_gb=${ifconfig_out#*TX bytes:}
-	rx_gb=$(echo ${rx_gb%% *} | awk '{ printf "%f", $1 / 1024 / 1024 / 1024 }')
+	local iface rbytes rpackets rerrs rdrop rfifo rframe rcompressed rmulticast tbytes tpackets terrs tdrop tfifo tcolls tcarrier tcompressed
+	while read iface rbytes rpackets rerrs rdrop rfifo rframe rcompressed rmulticast tbytes tpackets terrs tdrop tfifo tcolls tcarrier tcompressed; do
+		if [ "$iface" = "${interface}:" ]; then                 
+			tx_gb=${tbytes}
+			rx_gb=${rbytes}
+			break;                                         
+		fi                                                     
+	done < /proc/net/dev
+	tx_gb=$(echo ${tx_gb} | awk '{ printf "%f", $1 / 1024 / 1024 / 1024 }')
+	rx_gb=$(echo ${rx_gb} | awk '{ printf "%f", $1 / 1024 / 1024 / 1024 }')
 	network_cost=`echo "$tx_gb" "$TX_RATE" "$rx_gb" "$RX_RATE" | awk '{printf "%f %f", $1*$2, $3*$4}' | awk '{printf "%f", $1 + $2}'`
 	# Calculate uptime cost
 	uptime_cost=`echo "$hours" | awk "{printf \"%f\", "$rate" * $hours}"`
diff --git a/usr/lib/byobu/network b/usr/lib/byobu/network
index 2d7c63fb..5655a7d6 100755
--- a/usr/lib/byobu/network
+++ b/usr/lib/byobu/network
@@ -41,15 +41,13 @@ __network() {
 		esac
 		cache="$BYOBU_RUN_DIR/cache.$BYOBU_BACKEND/network.$i"
 		[ -r "$cache" ] && read x1 < "$cache" || tx1=0
-		IFS="$OIFS:"
 		local iface rbytes rpackets rerrs rdrop rfifo rframe rcompressed rmulticast tbytes tpackets terrs tdrop tfifo tcolls tcarrier tcompressed
 		while read iface rbytes rpackets rerrs rdrop rfifo rframe rcompressed rmulticast tbytes tpackets terrs tdrop tfifo tcolls tcarrier tcompressed; do
-			if [ "$iface" = "${interface}" ]; then
+			if [ "$iface" = "${interface}:" ]; then
 				[ "$i" = "up" ] && x2=${tbytes} || x2=${rbytes}
 				break;
 			fi
 		done < /proc/net/dev
-		IFS=$OIFS
 		echo "$x2" > "$cache"
 		rate=$((8*($x2 - $x1) / $t / 1024))  # in kbps
 		[ "$rate" -lt 0 ] && rate=0