diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 6b729a0057..5317dbde55 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -132,7 +132,8 @@ class wpdb {
 			return;
 		$args = func_get_args();
 		$query = array_shift($args);
-		$query = str_replace("'%s'", '%s', $query); // in case someone mistakenly already quoted it
+		$query = str_replace("'%s'", '%s', $query); // in case someone mistakenly already singlequoted it
+		$query = str_replace('"%s"', '%s', $query); // doublequote unquoting
 		$query = str_replace('%s', "'%s'", $query); // quote the strings
 		array_walk($args, array(&$this, 'escape_by_ref'));
 		return @vsprintf($query, $args);