diff --git a/include/serendipity_smarty_class.inc.php b/include/serendipity_smarty_class.inc.php
index 5b01c978..58d49c45 100644
--- a/include/serendipity_smarty_class.inc.php
+++ b/include/serendipity_smarty_class.inc.php
@@ -154,7 +154,7 @@ class Serendipity_Smarty extends Smarty
 
         $this->setConfigDir(array(S9Y_TEMPLATE_USERDEFAULT));
 
-        if ( ( !is_dir($this->getCompileDir()) || !is_writable($this->getCompileDir()) ) && IN_installer !== true) {
+        if ( ( !is_dir($this->getCompileDir()) || !is_writable($this->getCompileDir()) ) && IS_installed === true) {
             if(ini_get('display_errors') == 0 || ini_get('display_errors') == 'off') printf(DIRECTORY_WRITE_ERROR, $this->getCompileDir());
             trigger_error(sprintf(DIRECTORY_WRITE_ERROR, $this->getCompileDir()), E_USER_ERROR);
         }