diff --git a/change_log.txt b/change_log.txt
index 765434f9..ec0b1115 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,4 +1,7 @@
 ===== trunk  =====
+27.03.2012
+- bugfix prefilter did run multiple times on inline subtemplates compiled into several main templates (Forum Topic 21325)
+
 21.03.2012
 - bugfix compileAllTemplates() and compileAllConfig() did not return the number of compiled files (Forum Topic 21286)
 
diff --git a/libs/sysplugins/smarty_internal_templatecompilerbase.php b/libs/sysplugins/smarty_internal_templatecompilerbase.php
index c04e1ed2..51a8ce81 100644
--- a/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -161,7 +161,7 @@ abstract class Smarty_Internal_TemplateCompilerBase {
             $_content = $template->source->content;
             // run prefilter if required
             if (isset($this->smarty->autoload_filters['pre']) || isset($this->smarty->registered_filters['pre'])) {
-                $template->source->content = $_content = Smarty_Internal_Filter_Handler::runFilter('pre', $_content, $template);
+                $_content = Smarty_Internal_Filter_Handler::runFilter('pre', $_content, $template);
             }
             // on empty template just return header
             if ($_content == '') {