diff --git a/CHANGES b/CHANGES
index ae611c1cf..9496d97a1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -8,6 +8,7 @@ Emulation fixes:
  - GB Audio: Fix channels 1/2 staying muted if restarted after long silence
  - GB Serialize: Add missing Pocket Cam state to savestates
  - GB Video: Implement DMG-style sprite ordering
+ - GBA BIOS: Fix clobbering registers with word-sized CpuSet
  - GBA Video: Disable BG target 1 blending when OBJ blending (fixes mgba.io/i/2722)
 Other fixes:
  - Qt: Fix savestate preview sizes with different scales (fixes mgba.io/i/2560)
diff --git a/src/gba/hle-bios.c b/src/gba/hle-bios.c
index 84737afd4..f82d01f64 100644
--- a/src/gba/hle-bios.c
+++ b/src/gba/hle-bios.c
@@ -50,13 +50,13 @@ const uint8_t hleBios[GBA_SIZE_BIOS] = {
 	0x0c, 0x80, 0xbd, 0xe8, 0x30, 0x40, 0x2d, 0xe9, 0x02, 0x46, 0xa0, 0xe1,
 	0x00, 0xc0, 0xa0, 0xe1, 0x01, 0x50, 0xa0, 0xe1, 0x01, 0x04, 0x12, 0xe3,
 	0x0f, 0x00, 0x00, 0x0a, 0x01, 0x03, 0x12, 0xe3, 0x05, 0x00, 0x00, 0x0a,
-	0x24, 0x45, 0x85, 0xe0, 0x08, 0x00, 0xbc, 0xe8, 0x04, 0x00, 0x55, 0xe1,
-	0x08, 0x00, 0xa5, 0xb8, 0xfc, 0xff, 0xff, 0xba, 0x14, 0x00, 0x00, 0xea,
+	0x24, 0x45, 0x85, 0xe0, 0x08, 0x00, 0xb0, 0xe8, 0x04, 0x00, 0x51, 0xe1,
+	0x08, 0x00, 0xa1, 0xb8, 0xfc, 0xff, 0xff, 0xba, 0x14, 0x00, 0x00, 0xea,
 	0x01, 0xc0, 0xcc, 0xe3, 0x01, 0x50, 0xc5, 0xe3, 0xa4, 0x45, 0x85, 0xe0,
 	0xb0, 0x30, 0xdc, 0xe1, 0x04, 0x00, 0x55, 0xe1, 0xb2, 0x30, 0xc5, 0xb0,
 	0xfc, 0xff, 0xff, 0xba, 0x0c, 0x00, 0x00, 0xea, 0x01, 0x03, 0x12, 0xe3,
-	0x05, 0x00, 0x00, 0x0a, 0x24, 0x45, 0x85, 0xe0, 0x04, 0x00, 0x55, 0xe1,
-	0x08, 0x00, 0xbc, 0xb8, 0x08, 0x00, 0xa5, 0xb8, 0xfb, 0xff, 0xff, 0xba,
+	0x05, 0x00, 0x00, 0x0a, 0x24, 0x45, 0x85, 0xe0, 0x04, 0x00, 0x51, 0xe1,
+	0x08, 0x00, 0xb0, 0xb8, 0x08, 0x00, 0xa1, 0xb8, 0xfb, 0xff, 0xff, 0xba,
 	0x04, 0x00, 0x00, 0xea, 0xa4, 0x45, 0x85, 0xe0, 0x04, 0x00, 0x55, 0xe1,
 	0xb2, 0x30, 0xdc, 0xb0, 0xb2, 0x30, 0xc5, 0xb0, 0xfb, 0xff, 0xff, 0xba,
 	0x17, 0x3e, 0xa0, 0xe3, 0x30, 0x80, 0xbd, 0xe8, 0xf0, 0x47, 0x2d, 0xe9,
diff --git a/src/gba/hle-bios.s b/src/gba/hle-bios.s
index c891479a5..36e18790b 100644
--- a/src/gba/hle-bios.s
+++ b/src/gba/hle-bios.s
@@ -209,10 +209,10 @@ tst    r2, #0x04000000
 beq    1f
 @ Word
 add    r4, r5, r4, lsr #10
-ldmia  r12!, {r3}
+ldmia  r0!, {r3}
 2:
-cmp    r5, r4
-stmltia  r5!, {r3}
+cmp    r1, r4
+stmltia  r1!, {r3}
 blt    2b
 b      3f
 @ Halfword
@@ -233,9 +233,9 @@ beq    1f
 @ Word
 add    r4, r5, r4, lsr #10
 2:
-cmp    r5, r4
-ldmltia r12!, {r3}
-stmltia r5!, {r3}
+cmp    r1, r4
+ldmltia r0!, {r3}
+stmltia r1!, {r3}
 blt    2b
 b      3f
 @ Halfword