diff --git a/src/lib/fcitx-utils/i18nstring.cpp b/src/lib/fcitx-utils/i18nstring.cpp
index 96b84461..2c6f7436 100644
--- a/src/lib/fcitx-utils/i18nstring.cpp
+++ b/src/lib/fcitx-utils/i18nstring.cpp
@@ -14,9 +14,10 @@ const std::string &I18NString::match(const std::string &locale_) const {
     std::string locale = locale_;
     if (locale == "system") {
         char *lc = nullptr;
-        if constexpr (isAndroid()) {
+        if constexpr (isAndroid() || isApple()) {
             // bionic doesn't recognize locale other than C or C.UTF-8
             // https://android.googlesource.com/platform/bionic/+/refs/tags/android-11.0.0_r48/libc/bionic/locale.cpp#175
+            // macOS returns C for setlocale(LC_MESSAGES, nullptr)
             lc = getenv("FCITX_LOCALE");
         } else {
             lc = setlocale(LC_MESSAGES, nullptr);