diff --git a/src/gba/gba-bios.c b/src/gba/gba-bios.c
index 2b52cd94a..6a9855e04 100644
--- a/src/gba/gba-bios.c
+++ b/src/gba/gba-bios.c
@@ -221,6 +221,7 @@ void GBASwi16(struct ARMCore* cpu, int immediate) {
 	default:
 		GBALog(gba, GBA_LOG_STUB, "Stub software interrupt: %02X", immediate);
 	}
+	gba->memory.biosPrefetch = 0xE3A02004;
 }
 
 void GBASwi32(struct ARMCore* cpu, int immediate) {