diff --git a/engine/battle/core.asm b/engine/battle/core.asm
index b93b6fa7..ca3294b8 100644
--- a/engine/battle/core.asm
+++ b/engine/battle/core.asm
@@ -5324,8 +5324,7 @@ AIGetTypeEffectiveness:
 	inc hl
 	ld c, [hl]                 ; c = type 2 of player's pokemon
 	; initialize to neutral effectiveness
-	; bug: this is $10 (MORE_EFFECTIVE + 1) but should be 10 (EFFECTIVE)
-	ld a, MORE_EFFECTIVE + 1
+	ld a, $10 ; bug: should be EFFECTIVE (10)
 	ld [wTypeEffectiveness], a
 	ld hl, TypeEffects
 .loop
diff --git a/engine/battle/display_effectiveness.asm b/engine/battle/display_effectiveness.asm
index b23695cf..2879f847 100644
--- a/engine/battle/display_effectiveness.asm
+++ b/engine/battle/display_effectiveness.asm
@@ -1,7 +1,7 @@
 DisplayEffectiveness:
 	ld a, [wDamageMultipliers]
 	and $7F
-	cp $0A
+	cp EFFECTIVE
 	ret z
 	ld hl, SuperEffectiveText
 	jr nc, .done
diff --git a/engine/overworld/sprite_collisions.asm b/engine/overworld/sprite_collisions.asm
index ffed3708..e6d89480 100644
--- a/engine/overworld/sprite_collisions.asm
+++ b/engine/overworld/sprite_collisions.asm
@@ -1,5 +1,5 @@
 _UpdateSprites::
-	ld h, $c1
+	ld h, HIGH(wSpriteStateData1)
 	inc h
 	ld a, SPRITESTATEDATA2_IMAGEBASEOFFSET
 .spriteLoop