1 files changed, 1 insertions, 1 deletions
diff --git a/munin-plugin b/munin-plugin
index 8e59139..a0899db 100755
--- a/munin-plugin
+++ b/munin-plugin
@@ -50,7 +50,7 @@ if (!$ARGV[0]) {
 
 sub label2key {
     my $label = shift;
-    $label =~ s/[^a-xA-Z_]+/_/g;
+    $label =~ s/[^a-zA-Z0-9_]+/_/g;
     $label =~ s/^_+//;
     return $label;
 }