Index: includes/api/ApiQueryCategoryMembers.php
===================================================================
--- includes/api/ApiQueryCategoryMembers.php	(revision 23171)
+++ includes/api/ApiQueryCategoryMembers.php	(working copy)
@@ -63,6 +63,18 @@
 		$fld_title = isset($prop['title']);
 		$fld_sortkey = isset($prop['sortkey']);
 
+		// First, let's check if anything redirects to this cat
+		$cats = array($categoryTitle->getDBkey());
+		$db = $this->getDB();
+		$this->addTables(array('page', 'redirect'));
+		$this->addFields('page_title');
+		$this->addWhere('page_id = rd_from');
+		$this->addWhereFld('rd_title', $categoryTitle->getDBkey());
+		$res = $this->select(__METHOD__);
+		while($row = $db->fetchObject($res))
+			$cats[] = $row->page_title;
+		$this->resetQueryParams();
+
 		if (is_null($resultPageSet)) {
 			$this->addFields(array('cl_sortkey', 'page_namespace', 'page_title'));
 			$this->addFieldsIf('page_id', $fld_ids);
@@ -76,15 +88,13 @@
 
 		$this->addWhere('cl_from=page_id');
 		$this->setContinuation($params['continue']);		
-		$this->addWhereFld('cl_to', $categoryTitle->getDBkey());
+		$this->addWhereFld('cl_to', $cats);
 		$this->addWhereFld('page_namespace', $params['namespace']);
 		$this->addOption('ORDER BY', "cl_to, cl_sortkey, cl_from");
 
 		$limit = $params['limit'];
 		$this->addOption('LIMIT', $limit +1);
 
-		$db = $this->getDB();
-
 		$data = array ();
 		$count = 0;
 		$lastSortKey = null;