diff --git a/admin/cron.php b/admin/cron.php
index 1fc9c35..2a828f2 100644
--- a/admin/cron.php
+++ b/admin/cron.php
@@ -392,7 +392,11 @@
         //Execute backup's cron
         //Perhaps a long time and memory could help in large sites
         @set_time_limit(0);
-        @raise_memory_limit("192M");
+        if (empty($CFG->extramemorylimit)) {
+            raise_memory_limit("192M");
+        } else {
+            raise_memory_limit($CFG->extramemorylimit);
+        }
         if (function_exists('apache_child_terminate')) {
             // if we are running from Apache, give httpd a hint that 
             // it can recycle the process after it's done. Apache's