diff --git a/adafruit_ina219.py b/adafruit_ina219.py
index 9886817..a9ac25a 100644
--- a/adafruit_ina219.py
+++ b/adafruit_ina219.py
@@ -175,7 +175,7 @@ def __init__(self, i2c_bus, addr=0x40):
     raw_shunt_voltage       = ROUnaryStruct(_REG_SHUNTVOLTAGE, ">h")
 
     #bus voltage register
-    raw_bus_voltage         = ROBits( 12, _REG_BUSVOLTAGE, 3, 2, False)
+    raw_bus_voltage         = ROBits( 13, _REG_BUSVOLTAGE, 3, 2, False)
     conversion_ready        = ROBit(      _REG_BUSVOLTAGE, 1, 2, False)
     overflow                = ROBit(      _REG_BUSVOLTAGE, 0, 2, False)