diff --git a/lam/lib/modules/nisMailAlias.inc b/lam/lib/modules/nisMailAlias.inc
index 4e681261..3a7ef51c 100644
--- a/lam/lib/modules/nisMailAlias.inc
+++ b/lam/lib/modules/nisMailAlias.inc
@@ -233,7 +233,7 @@ class nisMailAlias extends baseModule {
 			// add alias name
 			// check format
 			if (get_preg($rawAccounts[$i][$ids['nisMailAlias_alias']], 'nis_alias')) {
-				$partialAccounts[$i]['cn'][] = $rawAccounts[$i][$ids['nisMailAlias_alias']];
+				$partialAccounts[$i]['cn'] = $rawAccounts[$i][$ids['nisMailAlias_alias']];
 			}
 			else {
 				$errMsg = $this->messages['alias'][1];