diff --git a/cache/Cache.php b/cache/Cache.php
index 0c63926e4..88015c096 100644
--- a/cache/Cache.php
+++ b/cache/Cache.php
@@ -175,7 +175,7 @@ class SS_Cache {
 		$backend = self::$backends[$backend_name];
 
 		$basicOptions = array(
-		    'cache_id_prefix' => $for . '_' . md5(BASE_PATH) . '_',
+		    'cache_id_prefix' => md5(BASE_PATH) . '_' . $for . '_',
         );
 
 		if ($cache_lifetime >= 0) {