diff --git a/wadsrc/static/actors/hexen/firedemon.txt b/wadsrc/static/actors/hexen/firedemon.txt
index cb29cdb07..4873e2609 100644
--- a/wadsrc/static/actors/hexen/firedemon.txt
+++ b/wadsrc/static/actors/hexen/firedemon.txt
@@ -46,6 +46,7 @@ ACTOR FireDemon 10060
 		FDMN ABC 5 Bright A_FiredChase
 		Loop
 	Pain:
+		FDMN D 0 Bright A_UnSetInvulnerable
 		FDMN D 6 Bright A_Pain
 		Goto Chase
 	Missile: