diff --git a/sys/dev/acpica/acpi_cpu.c b/sys/dev/acpica/acpi_cpu.c
index 49d2bd11fda..ea99cfdeb90 100644
--- a/sys/dev/acpica/acpi_cpu.c
+++ b/sys/dev/acpica/acpi_cpu.c
@@ -153,7 +153,9 @@ static struct sysctl_ctx_list cpu_sysctl_ctx;
 static struct sysctl_oid *cpu_sysctl_tree;
 static int		 cpu_cx_generic;
 static int		 cpu_cx_lowest_lim;
+#if defined(__i386__) || defined(__amd64__)
 static bool		 cppc_notify;
+#endif
 
 static struct acpi_cpu_softc **cpu_softc;
 ACPI_SERIAL_DECL(cpu, "ACPI CPU");
@@ -985,11 +987,13 @@ acpi_cpu_startup(void *arg)
 	NULL, 0, acpi_cpu_global_cx_lowest_sysctl, "A",
 	"Global lowest Cx sleep state to use");
 
+#if defined(__i386__) || defined(__amd64__)
     /* Add sysctl handler to control registering for CPPC notifications */
     cppc_notify = 1;
     SYSCTL_ADD_BOOL(&cpu_sysctl_ctx, SYSCTL_CHILDREN(cpu_sysctl_tree),
 	OID_AUTO, "cppc_notify", CTLFLAG_RDTUN | CTLFLAG_MPSAFE,
 	&cppc_notify, 0, "Register for CPPC Notifications");
+#endif
 
     /* Take over idling from cpu_idle_default(). */
     cpu_cx_lowest_lim = 0;