diff --git a/app/src/main/java/app/opass/ccip/ui/LanguagePreferenceFragment.kt b/app/src/main/java/app/opass/ccip/ui/LanguagePreferenceFragment.kt
index 4f7b2f73..2103dea8 100644
--- a/app/src/main/java/app/opass/ccip/ui/LanguagePreferenceFragment.kt
+++ b/app/src/main/java/app/opass/ccip/ui/LanguagePreferenceFragment.kt
@@ -34,6 +34,11 @@ class LanguagePreferenceFragment : DialogFragment() {
             layoutManager = LinearLayoutManager(requireContext())
             adapter = LanguagePreferenceAdapter(
                 items = listOf(
+                    LanguageOptionItem(
+                        languageTag = "x-default",
+                        localName = requireContext().getString(R.string.lang_translated_name_x_default),
+                        translatedName = requireContext().getString(R.string.lang_translated_name_x_default)
+                    ),
                     LanguageOptionItem(
                         languageTag = "en-US",
                         localName = requireContext().getString(R.string.lang_local_name_en_us),
@@ -78,7 +83,13 @@ class LanguagePreferenceFragment : DialogFragment() {
             ) { item ->
                 dialog?.dismiss()
                 AppCompatDelegate.setApplicationLocales(
-                    LocaleListCompat.forLanguageTags(item.languageTag)
+                    (
+                        if (item.languageTag == "x-default") {
+                            LocaleListCompat.getEmptyLocaleList()
+                        } else {
+                            LocaleListCompat.forLanguageTags(item.languageTag)
+                        }
+                    )
                 )
             }
         }
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index ed970304..9276994d 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -95,6 +95,7 @@
     <string name="failed_to_save_wifi_copied_to_clipboard">無法儲存 Wi-Fi 網路資訊。網路密碼已複製到剪貼簿。</string>
     <string name="switch_language">切換語言</string>
     <string name="choose_app_language">選擇應用程式語言</string>
+    <string name="lang_translated_name_x_default">系統預設</string>
     <string name="lang_translated_name_en_us">英語</string>
     <string name="lang_translated_name_nan_hant_tw">閩南語 - 傳統漢字</string>
     <string name="lang_translated_name_nan_latn_tw_pehoeji">閩南語 - 白話字</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5530bdf9..f1a9f8d2 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -96,6 +96,7 @@
     <string name="failed_to_save_wifi_copied_to_clipboard">Failed to save the Wi-Fi information. Password copied to clipboard.</string>
     <string name="switch_language">Switch language</string>
     <string name="choose_app_language">Choose app language</string>
+    <string name="lang_translated_name_x_default">System default</string>
     <string name="lang_local_name_en_us" translatable="false">English</string>
     <string name="lang_translated_name_en_us">English</string>
     <string name="lang_local_name_nan_hant_tw" translatable="false">閩南語 - 傳統漢字</string>