1 files changed, 6 insertions, 3 deletions
diff --git a/munin-plugin-agesinceseen b/munin-plugin-agesinceseen
index 9cd5f09..f052eb7 100755
--- a/munin-plugin-agesinceseen
+++ b/munin-plugin-agesinceseen
@@ -23,9 +23,12 @@ my @order = map { $agegroups{$_}; } sort { $a <=> $b } keys %agegroups;
 
 sub label2key {
     my $label = shift;
-    $label =~ s/[^a-zA-Z0-9_]+/_/g;
-    $label =~ s/^_+//;
-    return "_$label";
+    # Clean using method described on
+    # http://munin-monitoring.org/wiki/notes_on_datasource_names
+    $label =~ s/^[^A-Za-z_]/_/;
+    $label =~ s/[^A-Za-z0-9_]/_/g;
+
+    return "$label";
 }
 
 if (!$ARGV[0]) {