diff --git a/code/modules/mob/living/carbon/human/human_movement.dm b/code/modules/mob/living/carbon/human/human_movement.dm
index 37f1e9418b2..5c93ff2d731 100644
--- a/code/modules/mob/living/carbon/human/human_movement.dm
+++ b/code/modules/mob/living/carbon/human/human_movement.dm
@@ -1,7 +1,7 @@
 /mob/living/carbon/human/movement_delay()
 	var/tally = 0
 
-	if(species && species & IS_SLOW)
+	if(species && species.flags & IS_SLOW)
 		tally = 10
 
 	if (istype(loc, /turf/space)) return -1 // It's hard to be slowed down in space by... anything