diff --git a/src/utils/PasswordScorer.js b/src/utils/PasswordScorer.ts
similarity index 98%
rename from src/utils/PasswordScorer.js
rename to src/utils/PasswordScorer.ts
index 9d89942bf5..d8f3b0fb96 100644
--- a/src/utils/PasswordScorer.js
+++ b/src/utils/PasswordScorer.ts
@@ -63,7 +63,7 @@ _td("Short keyboard patterns are easy to guess");
  * @param {string} password Password to score
  * @returns {object} Score result with `score` and `feedback` properties
  */
-export function scorePassword(password) {
+export function scorePassword(password: string) {
     if (password.length === 0) return null;
 
     const userInputs = ZXCVBN_USER_INPUTS.slice();