diff --git a/hw/pc.c b/hw/pc.c
index 12c02f2..113a38a 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -565,7 +565,10 @@ static void bochs_bios_write(void *opaque, uint32_t addr, uint32_t val)
         /* LGPL'ed VGA BIOS messages */
     case 0x501:
     case 0x502:
+#ifdef DEBUG_BIOS
         exit((val << 1) | 1);
+#endif
+        break;
     case 0x500:
     case 0x503:
 #ifdef DEBUG_BIOS