diff --git a/src/websocket/frame.lua b/src/websocket/frame.lua
index 9888089..1c3fb37 100644
--- a/src/websocket/frame.lua
+++ b/src/websocket/frame.lua
@@ -3,12 +3,9 @@ local bit = require'websocket.bit'
 local band = bit.band
 local bxor = bit.bxor
 local bor = bit.bor
-local tremove = table.remove
-local srep = string.rep
 local ssub = string.sub
 local sbyte = string.byte
 local schar = string.char
-local band = bit.band
 local rshift = bit.rshift
 local tinsert = table.insert
 local tconcat = table.concat