diff --git a/lib/ldapauth.js b/lib/ldapauth.js
index b825fc0..3e28b06 100644
--- a/lib/ldapauth.js
+++ b/lib/ldapauth.js
@@ -298,12 +298,13 @@ LdapAuth.prototype._findUser = function (username, callback) {
             result.on('searchEntry', function (entry) {
                 items.push(entry.object);
             });
-            result.on('error', function (err) {
+            result.once('error', function (err) {
                 self.log && self.log.trace(err,
                     'ldap authenticate: search error event');
                 return callback(err);
             });
-            result.on('end', function (result) {
+            result.once('end', function (result) {
+                result.removeAllListeners();
                 if (result.status !== 0) {
                     var err = 'non-zero status from LDAP search: ' + result.status;
                     self.log && self.log.trace(err, 'ldap authenticate');