diff --git a/lib/resty/healthcheck.lua b/lib/resty/healthcheck.lua
index 264976f1..846db76e 100644
--- a/lib/resty/healthcheck.lua
+++ b/lib/resty/healthcheck.lua
@@ -68,7 +68,7 @@ do
     end
   end
 
-  local ok, is_array = pcall(require, "table.isarray")
+  ok, is_array = pcall(require, "table.isarray")
   if not ok then
     is_array = function(t)
       for k in pairs(t) do