diff --git a/plugins/network/interfaces_linux_multi b/plugins/network/interfaces_linux_multi
index eff953aa..6274d651 100755
--- a/plugins/network/interfaces_linux_multi
+++ b/plugins/network/interfaces_linux_multi
@@ -85,6 +85,7 @@
 use strict;
 use warnings;
 use Time::HiRes;
+use IO::Handle;
 
 my $plugin = $0;
 $plugin =~ s/.*\///;
@@ -130,7 +131,7 @@ if (defined $ENV{MUNIN_UPDATERATE}) {
 
 if (defined $ENV{MUNIN_CACHEFLUSH_RATE}) {
 	if ($ENV{MUNIN_CACHEFLUSH_RATE} =~ /^[0-9]+$/) {
-		$update_rate = int($ENV{MUNIN_CACHEFLUSH_RATE});
+		$flush_interval = int($ENV{MUNIN_CACHEFLUSH_RATE});
 	} else {
 		print STDERR "Invalid flush rate: $ENV{MUNIN_CACHEFLUSH_RATE}";
 	}
@@ -154,8 +155,8 @@ if (defined $ENV{MUNIN_IF_INCLUDE}) {
 	}
 }
 my $exclude_list = undef;
-if (defined $ENV{MUNIN_IF_INCLUDE}) {
-	$exclude_list = [ split(/[[:space:]]+/, $ENV{MUNIN_IF_INCLUDE}) ];
+if (defined $ENV{MUNIN_IF_EXCLUDE}) {
+	$exclude_list = [ split(/[[:space:]]+/, $ENV{MUNIN_IF_EXCLUDE}) ];
 	if (0 == scalar (@$exclude_list)) {
 		$exclude_list = undef;
 	} elsif ('' eq $exclude_list->[0]) {