diff --git a/src/machine/machine.c b/src/machine/machine.c
index c4ace6b4f..1684f312a 100644
--- a/src/machine/machine.c
+++ b/src/machine/machine.c
@@ -168,7 +168,7 @@ pit_irq0_timer(int new_out, int old_out)
 void
 machine_common_init(UNUSED(const machine_t *model))
 {
-    uint8_t cpu_requires_fast_pit = is486 || (is8086 && (cpu_s->rspeed >= 8000000));
+    uint8_t cpu_requires_fast_pit = is486 || (!is286 && is8086 && (cpu_s->rspeed >= 8000000));
 
     /* System devices first. */
     pic_init();