diff --git a/lib/pgsqlschema.php b/lib/pgsqlschema.php
index e8711a6f85..4fde80b55a 100644
--- a/lib/pgsqlschema.php
+++ b/lib/pgsqlschema.php
@@ -417,7 +417,7 @@ class PgsqlSchema extends Schema
      */
     function filterDef(array $tableDef)
     {
-        foreach (array_keys($tableDef['fields']) as $name => &$col) {
+        foreach ($tableDef['fields'] as $name => &$col) {
             // No convenient support for field descriptions
             unset($col['description']);