diff --git a/lib/resty/ada.lua b/lib/resty/ada.lua
index 2efc8e8..1496f5d 100644
--- a/lib/resty/ada.lua
+++ b/lib/resty/ada.lua
@@ -15,9 +15,7 @@ local ada_string_to_lua = utils.ada_string_to_lua
 local ada_owned_string_to_lua = utils.ada_owned_string_to_lua
 
 
-
-local ffi = require("ffi")
-local ffi_gc = ffi.gc
+local ffi_gc = require("ffi").gc
 
 
 local fmt = string.format
diff --git a/lib/resty/ada/utils.lua b/lib/resty/ada/utils.lua
index 7adee6a..bc8cf6a 100644
--- a/lib/resty/ada/utils.lua
+++ b/lib/resty/ada/utils.lua
@@ -9,8 +9,7 @@ local lib = require("resty.ada.lib")
 local new_tab = require("table.new")
 
 
-local ffi = require("ffi")
-local ffi_str = ffi.string
+local ffi_str = require("ffi").string
 
 
 local tonumber = tonumber