diff --git a/doom_fire.lua b/doom_fire.lua
index d75ebe2..41b1605 100644
--- a/doom_fire.lua
+++ b/doom_fire.lua
@@ -51,6 +51,13 @@ function TIC()
 		dofire()
 	end
 	t=t+1
+
+	-- put off fire after 3 seconds
+	if t == 3*60 then
+		for i=width*(height-1),width*height do
+			base[i] = 0
+		end
+	end
 end
 
 -- <TILES>