diff --git a/drivers/acpi/cm_sbs.c b/drivers/acpi/cm_sbs.c
index a01ce67..4a9b7bf 100644
--- a/drivers/acpi/cm_sbs.c
+++ b/drivers/acpi/cm_sbs.c
@@ -67,7 +67,7 @@
 		lock_ac_dir_cnt--;
 	if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
 		remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
-		acpi_ac_dir = 0;
+		acpi_ac_dir = NULL;
 	}
 	mutex_unlock(&cm_sbs_mutex);
 }
@@ -99,7 +99,7 @@
 	if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
 	    && acpi_battery_dir) {
 		remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
-		acpi_battery_dir = 0;
+		acpi_battery_dir = NULL;
 	}
 	mutex_unlock(&cm_sbs_mutex);
 	return;