--- so_taxes.install	2009-02-13 15:21:19.000000000 -0800
+++ so_taxes.install	2009-12-01 08:32:19.000000000 -0800
@@ -97,8 +97,7 @@ function so_taxes_schema() {
   
   BEGIN: schema definition for {cache_so_tax_rates'} db table
   *********************************/
-  $system_module_schema = system_schema();
-  $tables['cache_so_tax_rates'] = $system_module_schema['cache'];
+  $tables['cache_so_tax_rates'] = drupal_get_schema_unprocessed('system', 'cache');
   
   return $tables;
 }
@@ -132,4 +131,4 @@ function so_taxes_update_6000() {
   return $ret;
 }
 
-?>
\ No newline at end of file
+