diff --git a/gui.py b/gui.py
index e4ea68bf..6332b3ca 100644
--- a/gui.py
+++ b/gui.py
@@ -30,6 +30,13 @@ def run_tensorboard():
     subprocess.Popen([sys.executable, "-m", "tensorboard.main", "--logdir", "logs",
                      "--host", args.tensorboard_host, "--port", str(args.tensorboard_port)])
 
+def get_locale_compat():
+    lang = os.environ.get("LC_ALL") or os.environ.get("LC_CTYPE") or os.environ.get("LANG")
+    if lang:
+        lang = locale.normalize(lang).split('.')[0]
+    else:
+        lang = locale.getlocale()[0] or 'C'
+    return lang
 
 @catch_exception
 def run_tag_editor():
@@ -44,12 +51,11 @@ def run_tag_editor():
     if args.localization:
         cmd.extend(["--localization", args.localization])
     else:
-        l = locale.getdefaultlocale()[0]
+        l = get_locale_compat()
         if l and l.startswith("zh"):
             cmd.extend(["--localization", "zh-Hans"])
     subprocess.Popen(cmd)
 
-
 def launch():
     log.info("Starting SD-Trainer Mikazuki GUI...")
     log.info(f"Base directory: {base_dir_path()}, Working directory: {os.getcwd()}")