Index: database.mysql-common.inc
=========================================================
--- database.mysql-common.inc	(revision 1.17.2.1)
+++ database.mysql-common.inc	Working Copy
@@ -512,7 +512,7 @@
  */
 
 function db_change_field(&$ret, $table, $field, $field_new, $spec, $keys_new = array()) {
-  $sql = 'ALTER TABLE {'. $table .'} CHANGE '. $field .' '.
+  $sql = 'ALTER TABLE {'. $table .'} CHANGE `'. $field .'` '.
     _db_create_field_sql($field_new, _db_process_field($spec));
   if (count($keys_new)) {
     $sql .= ', ADD '. implode(', ADD ', _db_create_keys_sql($keys_new));
Index: database.pgsql.inc
=========================================================
--- database.pgsql.inc	(revision 1.68.2.5)
+++ database.pgsql.inc	Working Copy
@@ -906,7 +906,7 @@
  *   table specification but without the 'fields' element.
  */
 function db_change_field(&$ret, $table, $field, $field_new, $spec, $new_keys = array()) {
-  $ret[] = update_sql("ALTER TABLE {". $table ."} RENAME $field TO ". $field ."_old");
+  $ret[] = update_sql('ALTER TABLE {'. $table .'} RENAME "'. $field .'" TO "'. $field .'_old"');
   $not_null = isset($spec['not null']) ? $spec['not null'] : FALSE;
   unset($spec['not null']);