diff --git a/sys/powerpc/aim/aim_machdep.c b/sys/powerpc/aim/aim_machdep.c
index b09089069c2..784207e9a70 100644
--- a/sys/powerpc/aim/aim_machdep.c
+++ b/sys/powerpc/aim/aim_machdep.c
@@ -768,7 +768,8 @@ mpc745x_sleep()
 		while (1)
 			mtmsr(msr);
 	}
-	platform_smp_timebase_sync(timebase, 0);
+	/* XXX: The mttb() means this *only* works on single-CPU systems. */
+	mttb(timebase);
 	PCPU_SET(curthread, curthread);
 	PCPU_SET(curpcb, curthread->td_pcb);
 	pmap_activate(curthread);
diff --git a/sys/powerpc/aim/mp_cpudep.c b/sys/powerpc/aim/mp_cpudep.c
index b5931786f8f..33aae520c4b 100644
--- a/sys/powerpc/aim/mp_cpudep.c
+++ b/sys/powerpc/aim/mp_cpudep.c
@@ -311,9 +311,6 @@ cpudep_ap_setup()
 
 	vers = mfpvr() >> 16;
 
-	/* The following is needed for restoring from sleep. */
-	platform_smp_timebase_sync(0, 1);
-
 	switch(vers) {
 	case IBM970:
 	case IBM970FX: