diff --git a/performance/run.lua b/performance/run.lua
index 4fa0e55..8d8ba47 100644
--- a/performance/run.lua
+++ b/performance/run.lua
@@ -1,4 +1,4 @@
-require 'middleclass'
+local class = require 'middleclass'
 
 time = require 'performance/time'