diff --git a/includes/database/pgsql/schema.inc b/includes/database/pgsql/schema.inc
index b7a8fe4b41acd0eee5b6cb82c8273b63bb9e1228..30f12ef78ceba1b431a540fcbba4d0f8ef7ee687 100644
--- a/includes/database/pgsql/schema.inc
+++ b/includes/database/pgsql/schema.inc
@@ -368,7 +368,7 @@ public function addField($table, $field, $spec, $new_keys = array()) {
     $this->connection->query($query);
     if (isset($spec['initial'])) {
       $this->connection->update($table)
-        ->fields(array($field, $spec['initial']))
+        ->fields(array($field => $spec['initial']))
         ->execute();
     }
     if ($fixnull) {