diff --git a/sys/arm64/arm64/mp_machdep.c b/sys/arm64/arm64/mp_machdep.c
--- a/sys/arm64/arm64/mp_machdep.c
+++ b/sys/arm64/arm64/mp_machdep.c
@@ -138,7 +138,7 @@
 
 /* Stacks for AP initialization, discarded once idle threads are started. */
 void *bootstack;
-static void *bootstacks[MAXCPU - 1];
+static void **bootstacks;
 
 /* Count of started APs, used to synchronize access to bootstack. */
 static volatile int aps_started;
@@ -319,6 +319,7 @@
 		if (bootstacks[cpu - 1] != NULL)
 			kmem_free(bootstacks[cpu - 1], MP_BOOTSTACK_SIZE);
 	}
+	kmem_free(bootstacks, mp_maxid * sizeof(*bootstacks));
 }
 SYSINIT(smp_after_idle_runnable, SI_SUB_SMP, SI_ORDER_ANY,
     smp_after_idle_runnable, NULL);
@@ -774,6 +775,13 @@
 
 	mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
 
+	/*
+	 * Allocate pointers for the noot stacks. We have already allocated
+	 * the stack for CPU0. As we need a pointer for stacks 1 to mp_maxid
+	 * we need an array suze of mp_maxid.
+	 */
+	bootstacks = kmem_malloc(mp_maxid * sizeof(*bootstacks), M_WAITOK);
+
 	/* CPU 0 is always boot CPU. */
 	CPU_SET(0, &all_cpus);
 	mpidr = READ_SPECIALREG(mpidr_el1) & CPU_AFF_MASK;