diff --git a/vacation.p8 b/vacation.p8
index 19f0c7d..a04e6a4 100644
--- a/vacation.p8
+++ b/vacation.p8
@@ -430,8 +430,9 @@ sea = {}
 mknew(sea)
 
 function sea:draw()
- rectfill(0, 72+wave(), 128, 84, 0)
- poke2(0x5f78, 0xFF00.00FF <<> wave())
+ local w = wave()
+ rectfill(0, 72+w, 128, 84, 0)
+ poke2(0x5f78, 0xFF00.00FF <<> w)
 end
 
 arcade_level = {