diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index fd17ae0..3b912be 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -212,7 +212,7 @@
 extern int power_supply_am_i_supplied(struct power_supply *psy);
 extern int power_supply_set_battery_charged(struct power_supply *psy);
 
-#if defined(CONFIG_POWER_SUPPLY) || defined(CONFIG_POWER_SUPPLY_MODULE)
+#ifdef CONFIG_POWER_SUPPLY
 extern int power_supply_is_system_supplied(void);
 #else
 static inline int power_supply_is_system_supplied(void) { return -ENOSYS; }