diff --git a/src/playsim/p_mobj.cpp b/src/playsim/p_mobj.cpp
index fade8e640..c889c4e7b 100644
--- a/src/playsim/p_mobj.cpp
+++ b/src/playsim/p_mobj.cpp
@@ -4477,7 +4477,7 @@ void ConstructActor(AActor *actor, const DVector3 &pos, bool SpawningMapThing)
 
 	FRandom &rng = Level->BotInfo.m_Thinking ? pr_botspawnmobj : pr_spawnmobj;
 
-	if (!!(G_SkillProperty(SKILLP_InstantReaction) || !!(dmflags & DF_INSTANT_REACTION))
+	if ((!!G_SkillProperty(SKILLP_InstantReaction) || actor->flags5 & MF5_ALWAYSFAST || !!(dmflags & DF_INSTANT_REACTION))
 		&& actor->flags3 & MF3_ISMONSTER)
 		actor->reactiontime = 0;