diff --git a/scripts/snomasks.pl b/scripts/snomasks.pl
index d0608fe..070df16 100644
--- a/scripts/snomasks.pl
+++ b/scripts/snomasks.pl
@@ -19,6 +19,7 @@ if (weechat::register($SCRIPT_NAME, $SCRIPT_AUTHOR, $SCRIPT_VERSION,
  $SCRIPT_LICENCE, $SCRIPT_DESC, '', '')) {
 	weechat::bar_item_new('snomasks', 'bar_snomasks', '');
 	weechat::hook_signal('buffer_switch', 'buffer_switch', '');
+	weechat::hook_signal('irc_server_disconnected', 'irc_disconnected', '');
 	weechat::hook_signal('*,irc_raw_in_008', 'irc_008', '');
 }
 
@@ -48,3 +49,9 @@ sub irc_008 {
 	weechat::bar_item_update('snomasks');
 	return weechat::WEECHAT_RC_OK;
 }
+
+sub irc_disconnected {
+	my $server = pop;
+	delete $snomask{lc $server};
+	return weechat::WEECHAT_RC_OK;
+}