diff --git a/lemonldap-ng-common/scripts/convertSessions b/lemonldap-ng-common/scripts/convertSessions
index b5991ee30..66e1465a4 100755
--- a/lemonldap-ng-common/scripts/convertSessions
+++ b/lemonldap-ng-common/scripts/convertSessions
@@ -23,11 +23,13 @@ our $VERSION = "2.0.12";
 # -c: configuration file
 # -r: rename attributes
 # -i: ignore errors
+# -x: exclude attributes
 
 my $debug;
 my $config_file;
 my $ignore_errors;
 my %rename;
+my @exclude;
 my $help;
 my $nb_converted = 0;
 my $nb_error     = 0;
@@ -38,6 +40,7 @@ GetOptions(
     'config|c=s'      => \$config_file,
     'ignore-errors|i' => \$ignore_errors,
     'rename|r=s'      => \%rename,
+    'exclude|x=s'     => \@exclude,
 ) or pod2usage(2);
 pod2usage(
     -exitval  => 1,
@@ -133,6 +136,16 @@ Lemonldap::NG::Common::Apache::Session->get_key_from_all_sessions(
             }
         }
 
+        if (@exclude) {
+            for my $excludekey (@exclude) {
+                if ( $entry->{$excludekey} ) {
+                    print "Exclude $excludekey in session $id\n"
+                      if $debug;
+                    delete $entry->{$excludekey};
+                }
+            }
+        }
+
         print "Processing session $id\n" if $debug;
         my $s = Lemonldap::NG::Common::Session->new( {
                 storageModule        => $backendTo->{backend},