diff --git a/change_log.txt b/change_log.txt
index 80992bce..c4e98a56 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,4 +1,7 @@
 ===== trunk  =====
+29.07.2013
+- bugfix headers already send warning thrown when using 'SMARTY_DEBUG=on' from URL (Issue 148)
+
 27.07.2013
 - enhancement allow access to properties of registered opjects for Smarty2 BC (forum topic 24344)
 
diff --git a/libs/sysplugins/smarty_internal_debug.php b/libs/sysplugins/smarty_internal_debug.php
index ccb6a5fc..802a19ab 100644
--- a/libs/sysplugins/smarty_internal_debug.php
+++ b/libs/sysplugins/smarty_internal_debug.php
@@ -115,6 +115,7 @@ class Smarty_Internal_Debug extends Smarty_Internal_Data
         $smarty->left_delimiter = '{';
         $smarty->right_delimiter = '}';
         $smarty->debugging = false;
+        $smarty->debugging_ctrl = 'NONE';
         $smarty->force_compile = false;
         $_template = new Smarty_Internal_Template($smarty->debug_tpl, $smarty);
         $_template->caching = false;