diff --git a/src/power/BatteryLevel.cpp b/src/power/BatteryLevel.cpp
index fab1fbca4..324bc5849 100644
--- a/src/power/BatteryLevel.cpp
+++ b/src/power/BatteryLevel.cpp
@@ -359,7 +359,7 @@ bool AnalogBatteryLevel::isCharging()
 #endif
 #if defined(ELECROW_ThinkNode_M6)
     return digitalRead(EXT_CHRG_DETECT) == EXT_CHRG_DETECT_VALUE || isVbusIn();
-#elif EXT_CHRG_DETECT
+#elif defined(EXT_CHRG_DETECT)
     return digitalRead(EXT_CHRG_DETECT) == EXT_CHRG_DETECT_VALUE;
 #elif defined(BATTERY_CHARGING_INV)
     return !digitalRead(BATTERY_CHARGING_INV);