Use `let` instead of `const` in for loops.

1 files changed, 1 insertions, 1 deletions

diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index d0b7f4ca..eefba95e 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -33,7 +33,7 @@ function sanitizeOptions(options) {
         ankiKanjiFields:   {}
     };
 
-    for (const key in defaults) {
+    for (let key in defaults) {
         if (!options.hasOwnProperty(key)) {
             options[key] = defaults[key];
         }