1 files changed, 1 insertions, 1 deletions
diff --git a/munin-plugin-agesinceseen b/munin-plugin-agesinceseen
index 750ffba..0d83291 100755
--- a/munin-plugin-agesinceseen
+++ b/munin-plugin-agesinceseen
@@ -23,7 +23,7 @@ my @order = map { $agegroups{$_}; } sort { $a <=> $b } keys %agegroups;
 
 sub label2key {
     my $label = shift;
-    $label =~ s/[^a-xA-Z_]+/_/g;
+    $label =~ s/[^a-zA-Z0-9_]+/_/g;
     $label =~ s/^_+//;
     return $label;
 }