diff --git a/FU.pm b/FU.pm
index 9c85edf..6da28cb 100644
--- a/FU.pm
+++ b/FU.pm
@@ -217,17 +217,12 @@ sub monitor_path { push @monitor_paths, @_ }
 sub monitor_check :prototype(&) { $monitor_check = $_[0] }
 
 sub _monitor {
-    state %data;
     return 1 if $monitor_check && $monitor_check->();
 
     require File::Find;
     eval {
         File::Find::find({
-            wanted => sub {
-                my $m = (stat)[9];
-                $data{$_} //= $m;
-                die if $m > $data{$_};
-            },
+            wanted => sub { die if (-M) < 0 },
             no_chdir => 1
         }, grep -e, $scriptpath, values %INC, @monitor_paths);
         0