diff --git a/plugins/relayd/relayd b/plugins/relayd/relayd
index 3a4f29ee..d6931178 100755
--- a/plugins/relayd/relayd
+++ b/plugins/relayd/relayd
@@ -70,7 +70,7 @@ while ( $content =~ /table\s*<([^>]*)>\s*{([^}]*)}/g) {
         my $hosts = $2;
         $hosts =~ s/#.*$//mg; # comments
         $hosts =~ s/^\s+//mg; # trim spaces before lines
-        print "table $1: $hosts\n" if defined $ENV{MUNIN_DEBUG};
+        print "table $1: $hosts\n" if defined $Munin::Plugin::DEBUG;
         push @hosts , split /\s+/, $hosts;
 }
 
@@ -135,7 +135,7 @@ for my $host (@hosts) {
                 open(my $status, "relayctl show summary|") or die "can't open relayctl: $!";
                 while (<$status>) {
                         if (/([\w\.]+)\s+(\d+\.\d+)%/) {
-                                print "found spare value: $2 for $1\n" if defined $ENV{MUNIN_DEBUG};
+                                print "found spare value: $2 for $1\n" if defined $Munin::Plugin::DEBUG;
                                 $avail{$1} = $2 unless defined($avail{$1});
                         }
                 }