Index: t3lib/class.t3lib_sqlparser.php
===================================================================
--- t3lib/class.t3lib_sqlparser.php	(revision 6899)
+++ t3lib/class.t3lib_sqlparser.php	(working copy)
@@ -583,7 +583,7 @@
 						case 'ADDKEY':
 						case 'ADDPRIMARYKEY':
 							$result['KEY'] = $fieldKey;
-							$result['fields'] = $this->getValue($parseString,'_LIST');
+							$result['fields'] = $this->getValue($parseString, '_LIST', 'INDEX');
 							if ($this->parse_error)	{ return $this->parse_error; }
 						break;
 						case 'DROPKEY':