diff --git a/.luacheckrc b/.luacheckrc
index 36cac9b..2a9256a 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -1,9 +1,7 @@
 unused_args = false
-allow_defined_top = true
 
 globals = {
-	"minetest",
-	"mesecon"
+	"scifi_nodes"
 }
 
 read_globals = {
@@ -16,6 +14,11 @@ read_globals = {
 	"dump",
 
 	-- optional deps
-	"default", "stairsplus", "xpanes", "screwdriver"
+	"default",
+	"stairsplus",
+	"xpanes",
+	"screwdriver",
+	"minetest",
+	"mesecon"
 
 }
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..077e778
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,12 @@
+language: generic
+sudo: false
+addons:
+  apt:
+    packages:
+    - luarocks
+before_install:
+  - luarocks install --local luacheck
+script:
+- $HOME/.luarocks/bin/luacheck --no-color .
+notifications:
+  email: false
diff --git a/doors.lua b/doors.lua
index 3a214b6..557ef0e 100644
--- a/doors.lua
+++ b/doors.lua
@@ -66,7 +66,7 @@ for _, current_door in ipairs(doors) do
 	})
 
 
-	function onplace(itemstack, placer, pointed_thing)
+	local function onplace(itemstack, placer, pointed_thing)
 		-- Is there room enough ?
 		local pos1 = pointed_thing.above
 		local pos2 = {x=pos1.x, y=pos1.y, z=pos1.z}
@@ -120,11 +120,11 @@ for _, current_door in ipairs(doors) do
 		return itemstack;
 	end
 
-	function afterdestruct(pos, oldnode)
+	local function afterdestruct(pos, oldnode)
 		minetest.set_node({x=pos.x,y=pos.y+1,z=pos.z},{name="air"})
 	end
 
-	function open_door(pos, node, player, itemstack, pointed_thing)
+	local function open_door(pos, node, player, itemstack, pointed_thing)
 		-- play sound
 		minetest.sound_play(sound,{
 			max_hear_distance = 16,
@@ -181,12 +181,12 @@ for _, current_door in ipairs(doors) do
 			timer:start(3)
 	end
 
-	function afterplace(pos, placer, itemstack, pointed_thing)
+	local function afterplace(pos, placer, itemstack, pointed_thing)
 		local node = minetest.get_node(pos)
 		minetest.set_node({x=pos.x,y=pos.y+1,z=pos.z},{name=opened_top,param2=node.param2})
 	end
 
-	function ontimer(pos, elapsed)
+	local function ontimer(pos, elapsed)
 		-- play sound
 		minetest.sound_play(sound,{
 			max_hear_distance = 16,
diff --git a/nodeboxes.lua b/nodeboxes.lua
index d6efcc2..1d4f2a9 100644
--- a/nodeboxes.lua
+++ b/nodeboxes.lua
@@ -2,8 +2,8 @@
 -- GENERATED CODE
 -- Node Box Editor, version 0.9.0
 
-position1 = nil
-position2 = nil
+local position1 = nil
+local position2 = nil
 
 minetest.register_node("scifi_nodes:alienslope", {
 	description = "Alien Platform",
diff --git a/palm_scanner.lua b/palm_scanner.lua
index 9fb8a53..1b5279d 100644
--- a/palm_scanner.lua
+++ b/palm_scanner.lua
@@ -10,7 +10,7 @@
 local has_mesecons = minetest.get_modpath("mesecons")
 
 
-function activate_palm_scanner(pos, node, player)
+local function activate_palm_scanner(pos, node, player)
 	local name = player and player:get_player_name()
 	name = name or ""