diff --git a/tests/lua/cartesi-machine-tests.lua b/tests/lua/cartesi-machine-tests.lua
index f5e281b83..1651414fd 100755
--- a/tests/lua/cartesi-machine-tests.lua
+++ b/tests/lua/cartesi-machine-tests.lua
@@ -401,7 +401,6 @@ local periodic_action = false
 local periodic_action_period = math.maxinteger
 local periodic_action_start = 0
 local concurrency_update_merkle_tree = util.parse_number(os.getenv("CARTESI_CONCURRENCY_UPDATE_MERKLE_TREE")) or 0
-local cleanup = {}
 
 -- List of supported options
 -- Options are processed in order
@@ -604,10 +603,10 @@ local function run_machine_with_uarch(machine, ctx, max_mcycle)
 end
 
 local function connect()
-    local remote = protocol.connect(remote_address) -- server will be shutdown when remote is collected
+    local stub = protocol.connect(remote_address) -- server will be shutdown when remote is collected
     local version =
-        assert(remote.get_server_version(), "could not connect to remote cartesi machine at " .. remote_address)
-    return remote, version
+        assert(stub.get_server_version(), "could not connect to remote cartesi machine at " .. remote_address)
+    return stub, version
 end
 
 local function build_machine(ram_image)
diff --git a/tests/lua/cmio-test.lua b/tests/lua/cmio-test.lua
index 673673409..f95ed9fdc 100755
--- a/tests/lua/cmio-test.lua
+++ b/tests/lua/cmio-test.lua
@@ -26,7 +26,6 @@ end
 local MACHINES_DIR = adjust_images_path(test_util.cmio_path)
 
 local remote_address
-local cleanup = {}
 
 -- Print help and exit
 local function help()
diff --git a/tests/lua/machine-bind.lua b/tests/lua/machine-bind.lua
index ae4fa585a..d0430ed0b 100755
--- a/tests/lua/machine-bind.lua
+++ b/tests/lua/machine-bind.lua
@@ -22,10 +22,9 @@ local test_util = require("cartesi.tests.util")
 
 local remote_address
 local test_path = "./"
-local cleanup = {}
 local concurrency_update_merkle_tree = util.parse_number(os.getenv("CARTESI_CONCURRENCY_UPDATE_MERKLE_TREE")) or 0
 
-local lua_cmd = arg[-1] .. " -e "
+-- local lua_cmd = arg[-1] .. " -e "
 
 -- There is no UINT64_MAX in Lua, so we have to use the signed representation
 local MAX_MCYCLE = -1
diff --git a/tests/lua/machine-test.lua b/tests/lua/machine-test.lua
index fa14e4ba1..4cec9a2e2 100755
--- a/tests/lua/machine-test.lua
+++ b/tests/lua/machine-test.lua
@@ -28,7 +28,6 @@ local MAX_MCYCLE = -1
 
 local remote_address
 local test_path = "/tmp/"
-local cleanup = {}
 
 -- Print help and exit
 local function help()