diff --git a/src/machine/machine.c b/src/machine/machine.c
index 1684f312a..9e530eb3b 100644
--- a/src/machine/machine.c
+++ b/src/machine/machine.c
@@ -169,6 +169,7 @@ void
 machine_common_init(UNUSED(const machine_t *model))
 {
     uint8_t cpu_requires_fast_pit = is486 || (!is286 && is8086 && (cpu_s->rspeed >= 8000000));
+    cpu_requires_fast_pit = cpu_requires_fast_pit && !cpu_16bitbus;
 
     /* System devices first. */
     pic_init();