diff --git a/sys/dev/acpica/Osd/OsdSchedule.c b/sys/dev/acpica/Osd/OsdSchedule.c
index 8289c5df2d0..ac29c1ecfd4 100644
--- a/sys/dev/acpica/Osd/OsdSchedule.c
+++ b/sys/dev/acpica/Osd/OsdSchedule.c
@@ -95,10 +95,6 @@ TASKQUEUE_DEFINE(acpi, taskqueue_acpi_enqueue, 0,
 		 swi_add(NULL, "acpitaskq", taskqueue_acpi_run, NULL,
 		     SWI_TQ, 0, &taskqueue_acpi_ih));
 
-#if defined(ACPI_MAX_THREADS) && ACPI_MAX_THREADS > 0
-#define ACPI_USE_THREADS
-#endif
-
 #ifdef ACPI_USE_THREADS
 STAILQ_HEAD(, acpi_task_queue) acpi_task_queue;
 static struct mtx	acpi_task_mtx;
diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
index f8699f9ca00..d3ebc19501a 100644
--- a/sys/dev/acpica/acpi.c
+++ b/sys/dev/acpica/acpi.c
@@ -491,7 +491,7 @@ acpi_attach(device_t dev)
     }
 #endif
 
-#if defined(ACPI_MAX_THREADS) && ACPI_MAX_THREADS > 0
+#ifdef ACPI_USE_THREADS
     if ((error = acpi_task_thread_init())) {
 	goto out;
     }
diff --git a/sys/dev/acpica/acpivar.h b/sys/dev/acpica/acpivar.h
index edf2aa1e3cc..0cfe4464e40 100644
--- a/sys/dev/acpica/acpivar.h
+++ b/sys/dev/acpica/acpivar.h
@@ -385,7 +385,14 @@ extern int	acpi_cmbat_get_battinfo(int, struct acpi_battinfo *);
 
 extern int	acpi_acad_get_acline(int *);
 
-#if defined(ACPI_MAX_THREADS) && ACPI_MAX_THREADS > 0
+#ifndef ACPI_MAX_THREADS
+#define ACPI_MAX_THREADS	3
+#endif
+#if ACPI_MAX_THREADS > 0
+#define ACPI_USE_THREADS
+#endif
+
+#ifdef ACPI_USE_THREADS
 /*
  * ACPI task kernel thread initialization.
  */