diff --git a/vacuum_gambit.p8 b/vacuum_gambit.p8
index f8f20d0..c0b3eb9 100644
--- a/vacuum_gambit.p8
+++ b/vacuum_gambit.p8
@@ -1016,10 +1016,9 @@ mknew(chasey, function(ship)
 end)
 
 function chasey:act()
- local dx = 0
- if (self.x < primary_ship.x) dx=self.thrust
- if (self.x > primary_ship.x) dx=-self.thrust
- return dx, 0, false, self.x - 16 < primary_ship.x and self.x + 16 > primary_ship.x
+ self.xmin = max(primary_ship.x-8, 0)
+ self.xmax = min(primary_ship.x + 8, 112 - 8*self.size)
+ return 0, 0, false, self.x - 16 < primary_ship.x and self.x + 16 > primary_ship.x
 end
 
 xl_chasey=chasey.new{