diff --git a/app/code/core/Mage/Catalog/Model/Product/Image.php b/app/code/core/Mage/Catalog/Model/Product/Image.php
index e11958703ba..2f82065a65f 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Image.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Image.php
@@ -183,7 +183,7 @@ protected function _getMemoryLimit()
     {
         $memoryLimit = trim(strtoupper(ini_get('memory_limit')));
 
-        if (!isSet($memoryLimit[0])){
+        if (!isSet($memoryLimit)){
             $memoryLimit = "128M";
         }