diff --git a/Source/missiles.cpp b/Source/missiles.cpp
index 6f18db9d2..a085a2fac 100644
--- a/Source/missiles.cpp
+++ b/Source/missiles.cpp
@@ -238,6 +238,8 @@ bool MonsterMHit(int pnum, int m, int mindam, int maxdam, int dist, missile_id t
 			dam += player._pDamageMod;
 		else
 			dam += player._pDamageMod / 2;
+		if (monster.MData->mMonstClass == MonsterClass::Demon && (player._pIFlags & ISPL_3XDAMVDEM) != 0)
+			dam *= 3;
 	}
 	bool resist = monster.IsResistant(t);
 	if (!shift)