diff --git a/init.lua b/init.lua
index 50bcd9e..ae7f866 100644
--- a/init.lua
+++ b/init.lua
@@ -1,17 +1,17 @@
 -- clean by PilzAdam
 -- LICENSE: WTFPL
 
-local old_nodes = {"mod:a", "mod:b"}
+local old_nodes = {'mod:a', 'mod:b'}
 local old_entities = {}
 
 for _,node_name in ipairs(old_nodes) do
-    minetest.register_node(":"..node_name, {
+    minetest.register_node(':'..node_name, {
         groups = {old=1},
     })
 end
 
 minetest.register_abm({
-    nodenames = {"group:old"},
+    nodenames = {'group:old'},
     interval = 1,
     chance = 1,
     action = function(pos, node)
@@ -20,7 +20,7 @@ minetest.register_abm({
 })
 
 for _,entity_name in ipairs(old_entities) do
-    minetest.register_entity(":"..entity_name, {
+    minetest.register_entity(':'..entity_name, {
         on_activate = function(self, staticdata)
             self.object:remove()
         end,