diff --git a/CHANGES b/CHANGES
index a9a5bf44f..a2dddfa9c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -17,6 +17,7 @@ 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:
  - GBA Audio: Implement missing flags on SOUNDCNT_X register
 
diff --git a/src/gba/bios.c b/src/gba/bios.c
index ff2ee81be..76790e1ab 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;