diff --git a/app/code/community/Aoe/JsCssTstamp/Model/Observer.php b/app/code/community/Aoe/JsCssTstamp/Model/Observer.php
old mode 100755
new mode 100644
index e605cb7..700ff1b
--- a/app/code/community/Aoe/JsCssTstamp/Model/Observer.php
+++ b/app/code/community/Aoe/JsCssTstamp/Model/Observer.php
@@ -17,5 +17,8 @@ public function clean_media_cache_after()
         $dbStorage->getDirectoryModel()
             ->deleteDirectory('js')
             ->deleteDirectory('css');
+
+        // clean timestamp from config
+        Mage::getConfig()->saveConfig(Aoe_JsCssTstamp_Model_Package::XML_PATH_CACHEKEY, null);
     }
 }
diff --git a/app/code/community/Aoe/JsCssTstamp/Model/Package.php b/app/code/community/Aoe/JsCssTstamp/Model/Package.php
index d815ada..d6abd84 100644
--- a/app/code/community/Aoe/JsCssTstamp/Model/Package.php
+++ b/app/code/community/Aoe/JsCssTstamp/Model/Package.php
@@ -12,6 +12,8 @@ class Aoe_DesignFallback_Model_Design_Package extends Mage_Core_Model_Design_Pac
  */
 class Aoe_JsCssTstamp_Model_Package extends Aoe_DesignFallback_Model_Design_Package
 {
+    const XML_PATH_CACHEKEY = 'aoe/jscsststamp/aoe_jscsststamp_versionkey';
+
     const CACHEKEY = 'aoe_jscsststamp_versionkey';
 
     protected $cssProtocolRelativeUris;
@@ -245,6 +247,7 @@ protected function generateMergedUrl($type, array $files, $targetDir, $targetFil
 
     /**
      * Get a cached timestamp as version key
+     * If none then try get from config
      *
      * @return int timestamp
      */
@@ -252,8 +255,12 @@ protected function getVersionKey()
     {
         $timestamp = Mage::app()->loadCache(self::CACHEKEY);
         if (empty($timestamp)) {
-            $timestamp = time();
-            Mage::app()->saveCache($timestamp, self::CACHEKEY, array(), null);
+            $timestamp = Mage::getStoreConfig(self::XML_PATH_CACHEKEY);
+            if (empty($timestamp)) {
+                $timestamp = time();
+                Mage::getConfig()->saveConfig(self::XML_PATH_CACHEKEY, $timestamp);
+                Mage::app()->saveCache($timestamp, self::CACHEKEY, array(), null);
+            }
         }
 
         return $timestamp;