Index: includes/database.mysql-common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/Attic/database.mysql-common.inc,v
retrieving revision 1.17.2.1
diff -u -p -r1.17.2.1 database.mysql-common.inc
--- includes/database.mysql-common.inc	7 Feb 2008 10:17:26 -0000	1.17.2.1
+++ includes/database.mysql-common.inc	13 Jul 2009 09:40:18 -0000
@@ -335,7 +335,7 @@ function db_drop_field(&$ret, $table, $f
  *   Default value to be set. NULL for 'default NULL'.
  */
 function db_field_set_default(&$ret, $table, $field, $default) {
-  if ($default == NULL) {
+  if ($default === NULL) {
     $default = 'NULL';
   }
   else {