diff --git a/CHANGES b/CHANGES
index 9b80bb5d2..3112b38af 100644
--- a/CHANGES
+++ b/CHANGES
@@ -29,6 +29,7 @@ Bugfixes:
  - Qt: Add additional checks in CheatModel to prevent crashes
  - GBA Hardware: Fix Game Boy Player rumble in Pokemon Pinball
  - OpenGL: Fix fast-forward on some OpenGL drivers where it may block early
+ - GBA BIOS: Fix Sqrt sign
 Misc:
  - Qt: Window size command line options are now supported
  - Qt: Increase usability of key mapper
diff --git a/src/gba/bios.c b/src/gba/bios.c
index 0a570daf0..a17f2477d 100644
--- a/src/gba/bios.c
+++ b/src/gba/bios.c
@@ -213,7 +213,7 @@ void GBASwi16(struct ARMCore* cpu, int immediate) {
 		_Div(gba, cpu->gprs[1], cpu->gprs[0]);
 		break;
 	case 0x8:
-		cpu->gprs[0] = sqrt(cpu->gprs[0]);
+		cpu->gprs[0] = sqrt((uint32_t) cpu->gprs[0]);
 		break;
 	case 0xA:
 		cpu->gprs[0] = atan2f(cpu->gprs[1] / 16384.f, cpu->gprs[0] / 16384.f) / (2 * M_PI) * 0x10000;