diff --git a/plugins/disk/dirsizes b/plugins/disk/dirsizes
index a0c57dda..8630191c 100755
--- a/plugins/disk/dirsizes
+++ b/plugins/disk/dirsizes
@@ -26,6 +26,7 @@
 #
 
 use strict;
+use Munin::Plugin;
 my @watchdirs;
 
 if ( exists $ARGV[0] and $ARGV[0] eq "test" ) {
@@ -59,8 +60,7 @@ if ( exists $ARGV[0] and $ARGV[0] eq "config" ) {
     foreach my $dir (@watchdirs) {
 
         # Remove illegal characters
-        my $label = $dir;
-        $label =~ s@[\/-]@_@g;
+        my $label = clean_fieldname($dir);
 
         # Print name
         print "dir", $label, ".label ", $dir, "\n";
@@ -72,17 +72,12 @@ else {
 
     # All available directories
     foreach my $dir (@watchdirs) {
-
         # Remove illegal characters
-        my $label = $dir;
-        $label =~ s@[\/-]@_@g;
+        my $label = clean_fieldname($dir);
 
         # Get the dirsize
         my $dirsize = getSize($dir);
 
-        # Get the label
-        my $label = niceLabelname($dir);
-
         # Print name
         print "dir", $label, ".value ", $dirsize, ".0\n";
     }
@@ -97,13 +92,5 @@ sub getSize {
     return @dirsize[0];
 }
 
-# Remove illegal characters
-sub niceLabelname {
-    my ($label) = @_;
-
-    $label =~ s@[\/-]@_@g;
-    return $label;
-}
-
 exit 0;