diff --git a/external/importL10n/locales.js b/external/importL10n/locales.js
index 0a0e7cb72..54191ecbf 100644
--- a/external/importL10n/locales.js
+++ b/external/importL10n/locales.js
@@ -46,6 +46,13 @@ function downloadLanguageCodes() {
         response.on('end', function() {
           content = content.trim(); // Remove any leading/trailing white-space.
           var langCodes = normalizeText(content).split('\n');
+          // Remove all locales that we don't want to download below.
+          for (var langCode of [DEFAULT_LOCALE, ...EXCLUDE_LANG_CODES]) {
+            var i = langCodes.indexOf(langCode);
+            if (i > -1) {
+              langCodes.splice(i, 1);
+            }
+          }
           resolve(langCodes);
         });
       } else {
@@ -107,8 +114,7 @@ async function downloadL10n(root, callback) {
   var langCodes = await downloadLanguageCodes();
 
   for (var langCode of langCodes) {
-    if (!langCode || langCode === DEFAULT_LOCALE ||
-        EXCLUDE_LANG_CODES.includes(langCode)) {
+    if (!langCode) {
       continue;
     }
     await downloadLanguageFiles(root, langCode);
@@ -119,7 +125,7 @@ async function downloadL10n(root, callback) {
     var dirPath = path.join(root, entry), stat = fs.lstatSync(dirPath);
 
     if (stat.isDirectory() && entry !== DEFAULT_LOCALE &&
-        (!langCodes.includes(entry) || EXCLUDE_LANG_CODES.includes(entry))) {
+        !langCodes.includes(entry)) {
       removeCodes.push(entry);
     }
   }