diff --git a/lualib/sproto.lua b/lualib/sproto.lua
index 7907f406..4c285222 100644
--- a/lualib/sproto.lua
+++ b/lualib/sproto.lua
@@ -64,9 +64,9 @@ function sproto:pencode(typename, tbl)
 	return core.pack(core.encode(st, tbl))
 end
 
-function sproto:pdecode(typename, bin)
+function sproto:pdecode(typename, ...)
 	local st = querytype(self, typename)
-	return core.decode(st, core.unpack(bin))
+	return core.decode(st, core.unpack(...))
 end
 
 local function queryproto(self, pname)