diff --git a/plugins/lxc/lxc-multigraph b/plugins/lxc/lxc-multigraph
index 183fcc8f..6bd54a7a 100755
--- a/plugins/lxc/lxc-multigraph
+++ b/plugins/lxc/lxc-multigraph
@@ -267,25 +267,26 @@ EOF
       if [ -z "$device" ]; then
          continue
       fi
-      bps="U"
-      if [ -r "/sys/class/net/$device/speed" ]; then
-         megabit_per_second=$(cat "/sys/class/net/$device/speed")
-         bps=$((megabit_per_second * 1000 * 1000))
-      fi
       cat <<EOF
 $(clean_fieldname "net__${n}_down").label $n
 $(clean_fieldname "net__${n}_down").type DERIVE
 $(clean_fieldname "net__${n}_down").graph no
 $(clean_fieldname "net__${n}_down").cdef $(clean_fieldname "net__${n}_down"),8,*
 $(clean_fieldname "net__${n}_down").min 0
-$(clean_fieldname "net__${n}_down").max $bps
 $(clean_fieldname "net__${n}_up").label $n
 $(clean_fieldname "net__${n}_up").type DERIVE
 $(clean_fieldname "net__${n}_up").negative $(clean_fieldname "net__${n}_down")
 $(clean_fieldname "net__${n}_up").cdef $(clean_fieldname "net__${n}_up"),8,*
 $(clean_fieldname "net__${n}_up").min 0
+EOF
+      if [ -r "/sys/class/net/$device/speed" ]; then
+         megabit_per_second=$(cat "/sys/class/net/$device/speed")
+         bps=$((megabit_per_second * 1000 * 1000))
+         cat <<EOF
+$(clean_fieldname "net__${n}_down").max $bps
 $(clean_fieldname "net__${n}_up").max $bps
 EOF
+      fi
    done
 
    cat <<EOF