diff --git a/plugins/if_ b/plugins/if_
index 11b80c9..dc6b379 100644
--- a/plugins/if_
+++ b/plugins/if_
@@ -16,7 +16,7 @@ config_if() {
   echo "up.min 0"
   echo "up.negative down"
   echo "up.cdef up,8,*"
-  if [ -n "$(which ethtool)" ] && [ -x "$(which ethtool)" ] && ethtool "$INTERFACE" | grep -q Speed; then
+  if [ -n "$(which ethtool)" ] && [ -x "$(which ethtool)" ] && ethtool "$INTERFACE" 2>/dev/null | grep -q Speed; then
     MAX=$(($(ethtool "$INTERFACE" | grep Speed | sed -e 's/[[:space:]]\{1,\}/ /g' -e 's/^ //' -e 's/M.*//' | cut -d " " -f 2) * 1000000))
     echo "up.max $MAX"
     echo "down.max $MAX"