diff --git a/constants/map_object_constants.asm b/constants/map_object_constants.asm
index 191b3af9c..6b9d3cacf 100644
--- a/constants/map_object_constants.asm
+++ b/constants/map_object_constants.asm
@@ -58,10 +58,12 @@ EMOTE_OBJECT EQU 1 << EMOTE_OBJECT_F
 LOW_PRIORITY_F  EQU 0
 HIGH_PRIORITY_F EQU 1
 OVERHEAD_F      EQU 3
+USE_OBP1_F      EQU 4
 
 LOW_PRIORITY  EQU 1 << LOW_PRIORITY_F
 HIGH_PRIORITY EQU 1 << HIGH_PRIORITY_F
 OVERHEAD      EQU 1 << OVERHEAD_F
+USE_OBP1      EQU 1 << USE_OBP1_F
 
 ; object_struct OBJECT_PALETTE bit flags
 SWIMMING_F         EQU 5
diff --git a/data/sprites/map_objects.asm b/data/sprites/map_objects.asm
index ad712b967..c6070272b 100644
--- a/data/sprites/map_objects.asm
+++ b/data/sprites/map_objects.asm
@@ -198,7 +198,7 @@ SpriteMovementData:: ; 4273
 	db DOWN ; facing
 	db OBJECT_ACTION_STAND ; action
 	db 1 << 1 | FIXED_FACING | SLIDING | 1 << 5 ; flags1
-	db 1 << 4 ; flags2
+	db USE_OBP1 ; flags2
 	db 0 ; palette flags
 
 ; SPRITEMOVEDATA_STRENGTH_BOULDER
diff --git a/engine/overworld/map_objects.asm b/engine/overworld/map_objects.asm
index 74b82880d..765f3f93c 100644
--- a/engine/overworld/map_objects.asm
+++ b/engine/overworld/map_objects.asm
@@ -2973,35 +2973,35 @@ InitSprites: ; 5991
 	ld hl, OBJECT_SPRITE_TILE
 	add hl, bc
 	ld a, [hl]
-	and %01111111
+	and $ff ^ (1 << 7)
 	ld [hFFC1], a
 	xor a
 	bit 7, [hl]
 	jr nz, .skip1
-	or %00001000
+	or VRAM_BANK_1
 .skip1
 	ld hl, OBJECT_FLAGS2
 	add hl, bc
 	ld e, [hl]
 	bit 7, e
 	jr z, .skip2
-	or %10000000
+	or PRIORITY
 .skip2
-	bit 4, e
+	bit USE_OBP1_F, e
 	jr z, .skip3
-	or %00010000
+	or OBP_NUM
 .skip3
 	ld hl, OBJECT_PALETTE
 	add hl, bc
 	ld d, a
 	ld a, [hl]
-	and %00000111
+	and PALETTE_MASK
 	or d
 	ld d, a
 	xor a
-	bit 3, e
+	bit OVERHEAD_F, e
 	jr z, .skip4
-	or %10000000
+	or PRIORITY
 .skip4
 	ld [hFFC2], a
 	ld hl, OBJECT_SPRITE_X