diff --git a/druid/helper.lua b/druid/helper.lua
index 590f5ae..71233ef 100644
--- a/druid/helper.lua
+++ b/druid/helper.lua
@@ -5,6 +5,7 @@ local const = require("druid.const")
 
 local M = {}
 
+local system_name = sys.get_sys_info().system_name
 
 --- Text node or icon node can be nil
 local function get_text_width(text_node)
@@ -182,15 +183,13 @@ end
 --- Check if device is mobile (Android or iOS)
 -- @function helper..is_mobile
 function M.is_mobile()
-	local system_name = sys.get_sys_info().system_name
-	return system_name == const.OS.IOS or system_name == const.OS.ANDROID
+	return system_name == const.OS.IOS or SYSTEM_NAME == const.OS.ANDROID
 end
 
 
 --- Check if device is HTML5
 -- @function helper.is_web
 function M.is_web()
-	local system_name = sys.get_sys_info().system_name
 	return system_name == const.OS.BROWSER
 end