diff --git a/misc/cronjobs/anonymize_last_borrowers.pl b/misc/cronjobs/anonymize_last_borrowers.pl
index 28de63a1f9..e0287fe075 100755
--- a/misc/cronjobs/anonymize_last_borrowers.pl
+++ b/misc/cronjobs/anonymize_last_borrowers.pl
@@ -36,6 +36,7 @@ use C4::Log;
 sub usage {
     print STDERR <<USAGE;
 Usage: $0  [-h|--help]
+   -c --confirm       required to actually perform the anonymization
    -v --verbose       gives a little more information
    -h --help          prints this help message, and exits, ignoring all
                       other options
@@ -44,11 +45,12 @@ USAGE
     exit $_[0];
 }
 
-my ( $help, $verbose );
+my ( $help, $verbose, $confirm );
 
 GetOptions(
     'h|help'    => \$help,
     'v|verbose' => \$verbose,
+    'c|confirm' => \$confirm,
 ) || usage(1);
 
 if ($help) {
@@ -62,6 +64,12 @@ if ( !$pref ) {
     usage(1);
 }
 
+unless ($confirm) {
+    print STDERR "You must use the --confirm flag to run this script.\n";
+    print STDERR "Add --confirm to actually perform the anonymization.\n";
+    exit(1);
+}
+
 cronlogaction();
 
 my $rows = Koha::Patrons->anonymize_last_borrowers();