diff --git a/change_log.txt b/change_log.txt
index 3d3f2e34f..c180868de 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,5 +1,7 @@
-===== 3.1.33-dev-3 =====
+===== 3.1.33-dev-4 =====
 17.05.2018
+ - Smarty::compileAllTemplates ignores `$extension` parameter https://github.com/smarty-php/smarty/issues/437
+   https://github.com/smarty-php/smarty/pull/438
  - improvement do not compute total property in {foreach} if not needed https://github.com/smarty-php/smarty/issues/443
  - bugfix  plugins may not be loaded when setMergeCompiledIncludes is true https://github.com/smarty-php/smarty/issues/435
 
diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index 2116f74da..ad52cbc65 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -112,7 +112,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '3.1.33-dev-3';
+    const SMARTY_VERSION = '3.1.33-dev-4';
     /**
      * define variable scopes
      */
diff --git a/libs/sysplugins/smarty_internal_method_compilealltemplates.php b/libs/sysplugins/smarty_internal_method_compilealltemplates.php
index 64912599f..6e7c40cd2 100644
--- a/libs/sysplugins/smarty_internal_method_compilealltemplates.php
+++ b/libs/sysplugins/smarty_internal_method_compilealltemplates.php
@@ -75,7 +75,7 @@ protected function compileAll(Smarty $smarty,
                 if (substr(basename($_fileinfo->getPathname()), 0, 1) === '.' || strpos($_file, '.svn') !== false) {
                     continue;
                 }
-                if (!substr_compare($_file, $extension, -strlen($extension)) === 0) {
+                if (substr_compare($_file, $extension, -strlen($extension)) !== 0) {
                     continue;
                 }
                 if ($_fileinfo->getPath() !== substr($_dir, 0, -1)) {