diff --git a/change_log.txt b/change_log.txt
index 6331db4a..b016c31d 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,6 +1,7 @@
 ===== trunk  =====
 06.02.2012
 - improvement stream_resolve_include_path() added to Smarty_Internal_Get_Include_Path (Forum Topic 20980)
+- bugfix fetch('extends:foo.tpl') always yielded $source->exists == true (Forum Topic 20980)
 
 30.01.2012
 - bugfix Smarty_Security internal $_resource_dir cache wasn't properly propagated
diff --git a/libs/sysplugins/smarty_internal_resource_extends.php b/libs/sysplugins/smarty_internal_resource_extends.php
index 9400c00f..9481d992 100644
--- a/libs/sysplugins/smarty_internal_resource_extends.php
+++ b/libs/sysplugins/smarty_internal_resource_extends.php
@@ -45,7 +45,7 @@ class Smarty_Internal_Resource_Extends extends Smarty_Resource {
             $sources[$s->uid] = $s;
             $uid .= $s->filepath;
             if ($_template && $_template->smarty->compile_check) {
-                $exists == $exists && $s->exists;
+                $exists = $exists && $s->exists;
             }
         }
         $source->components = $sources;
@@ -68,7 +68,7 @@ class Smarty_Internal_Resource_Extends extends Smarty_Resource {
     {
         $source->exists = true;
         foreach ($source->components as $s) {
-            $source->exists == $source->exists && $s->exists;
+            $source->exists = $source->exists && $s->exists;
         }
         $source->timestamp = $s->timestamp;
     }