diff --git a/core/plugin.lua b/core/plugin.lua
index 12f0e8d..4274c04 100644
--- a/core/plugin.lua
+++ b/core/plugin.lua
@@ -201,6 +201,7 @@ function plugin.PrepareEnvironment(plugin_id)
     local Env = {}
     Env.table = DeepCopy(require('table'))
     Env.string = DeepCopy(require('string'))
+    Env.math = DeepCopy(require('math'))
     Env.json = DeepCopy(require('json'))
     Env.DBI = DeepCopy(require('DBI'))
     Env.redis = DeepCopy(require('redis'))