diff --git a/homeassistant/components/integration/sensor.py b/homeassistant/components/integration/sensor.py
index 57ec6fefe29..6201348f21c 100644
--- a/homeassistant/components/integration/sensor.py
+++ b/homeassistant/components/integration/sensor.py
@@ -39,7 +39,7 @@ RIGHT_METHOD = "right"
 INTEGRATION_METHOD = [TRAPEZOIDAL_METHOD, LEFT_METHOD, RIGHT_METHOD]
 
 # SI Metric prefixes
-UNIT_PREFIXES = {None: 1, "k": 10 ** 3, "G": 10 ** 6, "T": 10 ** 9}
+UNIT_PREFIXES = {None: 1, "k": 10 ** 3, "M": 10 ** 6, "G": 10 ** 9, "T": 10 ** 12}
 
 # SI Time prefixes
 UNIT_TIME = {