Index: wp-includes/classes.php
===================================================================
--- wp-includes/classes.php	(revision 4476)
+++ wp-includes/classes.php	(working copy)
@@ -598,13 +598,13 @@
 		}
 
 		if ( $this->is_attachment ) {
-			$where .= ' AND (post_status = "attachment")';
+			$where .= " AND (post_status = 'attachment')";
 		} elseif ($this->is_page) {
-			$where .= ' AND (post_status = "static")';
+			$where .= " AND (post_status = 'static')";
 		} elseif ($this->is_single) {
-			$where .= ' AND (post_status != "static")';
+			$where .= " AND (post_status != 'static')";
 		} else {
-			$where .= ' AND (post_status = "publish"';
+			$where .= " AND (post_status = 'publish'";
 
 			if (isset($user_ID) && ('' != intval($user_ID)))
 				$where .= " OR post_author = $user_ID AND post_status != 'draft' AND post_status != 'static')";
@@ -613,7 +613,7 @@
 		}
 
 		if (! $this->is_attachment )
-			$where .= ' AND post_status != "attachment"';
+			$where .= " AND post_status != 'attachment'";
 
 		// Apply filters on where and join prior to paging so that any
 		// manipulations to them are reflected in the paging by day queries.