diff --git a/lua/apisix/plugins/grpc-proxy/proto.lua b/lua/apisix/plugins/grpc-proxy/proto.lua
index cde27e1bb866a..9c0c9a05b743d 100644
--- a/lua/apisix/plugins/grpc-proxy/proto.lua
+++ b/lua/apisix/plugins/grpc-proxy/proto.lua
@@ -1,14 +1,11 @@
 local core     = require("apisix.core")
 local protoc   = require("protoc")
+local lrucache = require("apisix.core.lrucache")
 local config   = require("apisix.core.config_etcd")
 local schema   = require("apisix.core.schema")
 local protos
 
 
-local lrucache_proto = core.lrucache.new({
-    ttl = 300, count = 256
-})
-
 local function protos_arrange(proto_id)
     if protos.values == nil then
         return nil
@@ -39,9 +36,8 @@ end
 local _M = {version = 0.1}
 
 
-_M.new = function(proto_id)
-    local key = "/proto" .. proto_id
-    return lrucache_proto(key, protos.conf_version, protos_arrange, proto_id)
+function _M.new(proto_id)
+    return lrucache.global("/protoc", protos.conf_version, protos_arrange, proto_id)
 end