diff --git a/drivers/acpi/thermal_lib.c b/drivers/acpi/thermal_lib.c
index 646ff6bda6dd..4e0519ca9739 100644
--- a/drivers/acpi/thermal_lib.c
+++ b/drivers/acpi/thermal_lib.c
@@ -9,6 +9,7 @@
 #include <linux/acpi.h>
 #include <linux/units.h>
 #include <linux/thermal.h>
+#include "internal.h"
 
 /*
  * Minimum temperature for full military grade is 218°K (-55°C) and