diff --git a/firmware/powermgmt.c b/firmware/powermgmt.c
index ca24740..319f242 100644
--- a/firmware/powermgmt.c
+++ b/firmware/powermgmt.c
@@ -143,7 +143,7 @@ static int runcurrent(void);
 
 void battery_read_info(int *voltage, int *level)
 {
-    int millivolts = _battery_voltage();
+    int millivolts = battery_voltage();
     int percent;
 
     if (voltage)