diff --git a/engine/battle/effects.asm b/engine/battle/effects.asm
index 394e07e51..20e792d82 100644
--- a/engine/battle/effects.asm
+++ b/engine/battle/effects.asm
@@ -41,7 +41,7 @@ SleepEffect:
 	                        ; including the event where the target already has another status
 	ld a, [de]
 	ld b, a
-	and $7
+	and SLP_MASK
 	jr z, .notAlreadySleeping ; can't affect a mon that is already asleep
 	ld hl, AlreadyAsleepText
 	jp PrintText
@@ -58,7 +58,7 @@ SleepEffect:
 .setSleepCounter
 ; set target's sleep counter to a random number between 1 and 7
 	call BattleRandom
-	and $7
+	and SLP_MASK
 	jr z, .setSleepCounter
 	ld [de], a
 	call PlayCurrentMoveAnimation2