diff --git a/code/game/objects/effects/step_triggers.dm b/code/game/objects/effects/step_triggers.dm
index 67f30e984e2..f6369e0c1af 100644
--- a/code/game/objects/effects/step_triggers.dm
+++ b/code/game/objects/effects/step_triggers.dm
@@ -16,7 +16,7 @@
 		return
 	if(istype(H, /mob/dead/observer) && !affect_ghosts)
 		return
-	if(istype(H, /mob) && !mobs_only)
+	if(!istype(H, /mob) && mobs_only)
 		return
 	Trigger(H)