diff --git a/sync-strings.js b/sync-strings.js
index 47ca48b..74b5c66 100644
--- a/sync-strings.js
+++ b/sync-strings.js
@@ -8,10 +8,10 @@ const assertDirExists = (dir) => {
   }
 }
 
-const getLangStringsMap = (dir) => {
+const getLangStringsMap = (dir, filterLangsFn = filterLangs) => {
   const langStringsMap = {}
   fs.readdirSync(dir)
-    .filter(filterLangs)
+    .filter(filterLangsFn)
     .forEach((lang) => {
       const langPath = path.join(dir, lang, 'messages.json')
       const langMap = JSON.parse(fs.readFileSync(langPath, 'utf8'))
@@ -46,12 +46,19 @@ const syncLangStrings = (destDir, sourceLangStringsMap, destLangStringsMap) => {
       }
       Object.keys(langMap).forEach((key) => {
         if (sourceLangStringsMap[lang][key] || newFile) {
-          // Make sure that the source language contains the string to be translated
-          // This avoids keeping translations for removed strings
-          if (destLangStringsMap.en[key]) {
-            langMap[key].message =
-              formattingFixer(brandingFixer(sourceLangStringsMap[lang][key]))
-          }
+          langMap[key].message =
+            formattingFixer(brandingFixer(sourceLangStringsMap[lang][key]))
+        }
+        // Make sure that the source language contains the string to be translated
+        // This avoids keeping translations for removed strings
+        if (!destLangStringsMap.en[key]) {
+          delete langMap[key]
+        }
+      })
+      // Make sure we have English strings for any string that's missing
+      Object.keys(destLangStringsMap.en).forEach((key) => {
+        if (!langMap[key]) {
+          langMap[key] = destLangStringsMap.en[key]
         }
       })
       const data = JSON.stringify(langMap, null, 2)
@@ -87,7 +94,7 @@ const syncStrings = (sourceDir, destDir) => {
   assertDirExists(destDir)
 
   const sourceLangStringsMap = getLangStringsMap(sourceDir)
-  const destLangStringsMap = getLangStringsMap(destDir)
+  const destLangStringsMap = getLangStringsMap(destDir, (lang) => lang === 'en')
   const sourceLangs = Object.keys(sourceLangStringsMap)
 
   syncDirs(destDir, sourceLangs)