diff --git a/youtube_dl_gui/optionsmanager.py b/youtube_dl_gui/optionsmanager.py
index 291c021..a36b64e 100644
--- a/youtube_dl_gui/optionsmanager.py
+++ b/youtube_dl_gui/optionsmanager.py
@@ -13,7 +13,8 @@ from .utils import (
     os_path_exists,
     encode_tuple,
     decode_tuple,
-    check_path
+    check_path,
+    get_default_lang
 )
 
 from .formats import (
@@ -282,7 +283,7 @@ class OptionsManager(object):
             'enable_log': True,
             'log_time': True,
             'workers_number': 3,
-            'locale_name': 'en_US',
+            'locale_name': get_default_lang(),
             'main_win_size': (740, 490),
             'opts_win_size': (640, 490),
             'selected_video_formats': ['webm', 'mp4'],
diff --git a/youtube_dl_gui/utils.py b/youtube_dl_gui/utils.py
index a966ae8..729c007 100644
--- a/youtube_dl_gui/utils.py
+++ b/youtube_dl_gui/utils.py
@@ -116,6 +116,9 @@ os_path_abspath = convert_on_bounds(os.path.abspath)
 os_path_realpath = convert_on_bounds(os.path.realpath)
 os_path_expanduser = convert_on_bounds(os.path.expanduser)
 
+# Patch locale functions
+locale_getdefaultlocale = convert_on_bounds(locale.getdefaultlocale)
+
 # Patch Windows specific functions
 if os.name == 'nt':
     os_startfile = convert_on_bounds(os.startfile)
@@ -376,3 +379,13 @@ def build_command(options_list, url):
     url = "\"{}\"".format(url)
 
     return " ".join([YOUTUBEDL_BIN] + options + [url])
+
+
+def get_default_lang():
+    """Get default language using the 'locale' module."""
+    default_lang, _ = locale_getdefaultlocale()
+
+    if not default_lang:
+        default_lang = "en_US"
+
+    return default_lang