diff --git a/sys/pc98/pc98/machdep.c b/sys/pc98/pc98/machdep.c
index 92f0dccd3780..443518697cb1 100644
--- a/sys/pc98/pc98/machdep.c
+++ b/sys/pc98/pc98/machdep.c
@@ -1359,21 +1359,6 @@ idle_sysctl(SYSCTL_HANDLER_ARGS)
 SYSCTL_PROC(_machdep, OID_AUTO, idle, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
     idle_sysctl, "A", "currently selected idle function");
 
-uint64_t (*atomic_load_acq_64)(volatile uint64_t *) =
-    atomic_load_acq_64_i386;
-void (*atomic_store_rel_64)(volatile uint64_t *, uint64_t) =
-    atomic_store_rel_64_i386;
-
-static void
-cpu_probe_cmpxchg8b(void)
-{
-
-	if ((cpu_feature & CPUID_CX8) != 0) {
-		atomic_load_acq_64 = atomic_load_acq_64_i586;
-		atomic_store_rel_64 = atomic_store_rel_64_i586;
-	}
-}
-
 /*
  * Reset registers to default values on exec.
  */
@@ -2422,8 +2407,6 @@ init386(first)
 	thread0.td_pcb->pcb_cr3 = (int)IdlePTD;
 	thread0.td_pcb->pcb_ext = 0;
 	thread0.td_frame = &proc0_tf;
-
-	cpu_probe_cmpxchg8b();
 }
 
 void