diff --git a/homeassistant/components/opower/strings.json b/homeassistant/components/opower/strings.json
index 362e6cd7596..749545743fe 100644
--- a/homeassistant/components/opower/strings.json
+++ b/homeassistant/components/opower/strings.json
@@ -11,7 +11,7 @@
       "mfa": {
         "description": "The TOTP secret below is not one of the 6 digit time-based numeric codes. It is a string of around 16 characters containing the shared secret that enables your authenticator app to generate the correct time-based code at the appropriate time. See the documentation.",
         "data": {
-          "totp_secret": "TOTP Secret"
+          "totp_secret": "TOTP secret"
         }
       },
       "reauth_confirm": {
@@ -19,7 +19,7 @@
         "data": {
           "username": "[%key:common::config_flow::data::username%]",
           "password": "[%key:common::config_flow::data::password%]",
-          "totp_secret": "TOTP Secret"
+          "totp_secret": "[%key:component::opower::config::step::mfa::data::totp_secret%]"
         }
       }
     },