diff --git a/code/game/turfs/turf.dm b/code/game/turfs/turf.dm
index 80a70d5c04..d2cd7a18d5 100644
--- a/code/game/turfs/turf.dm
+++ b/code/game/turfs/turf.dm
@@ -86,7 +86,7 @@
 
 	//Finally, check objects/mobs to block entry that are not on the border
 	for(var/atom/movable/obstacle in src)
-		if(obstacle.flags & ~ON_BORDER)
+		if(!(obstacle.flags & ON_BORDER))
 			if(!obstacle.CanPass(mover, mover.loc, 1, 0) && (forget != obstacle))
 				mover.Bump(obstacle, 1)
 				return 0