diff --git a/init.lua b/init.lua
index cb52e66..d035f15 100644
--- a/init.lua
+++ b/init.lua
@@ -412,6 +412,11 @@ for i = 31, 255 do
 			reset_meta(pos)
 		end,
 		on_receive_fields = function(pos, formname, fields, sender)
+			local name = sender:get_player_name()
+			if minetest.is_protected(pos, name) and not minetest.check_player_privs(name, {protection_bypass=true}) then
+				minetest.record_protection_violation(pos, name)
+				return
+			end
 			if (fields.channel) then
 				minetest.get_meta(pos):set_string("channel", fields.channel)
 			end