diff --git a/lib/SimpleSAML/Auth/LDAP.php b/lib/SimpleSAML/Auth/LDAP.php
index f2a6b374ee56b4b2aa51ba167445a297fe48da85..feea4699b595677744820028e4dde59432cd3f3c 100644
--- a/lib/SimpleSAML/Auth/LDAP.php
+++ b/lib/SimpleSAML/Auth/LDAP.php
@@ -127,7 +127,7 @@ class SimpleSAML_Auth_LDAP {
 				return NULL;
 			} else {
 				throw new Exception('LDAP search returned zero entries: ' . $searchattr . '=' . $searchvalue . ' base(s): ' . 
-					join(',', $searchbase));
+					join(',', $searchbases));
 			}
 		}