diff --git a/UM/Application.py b/UM/Application.py

index f8f337a72..e53b81ba7 100644

--- a/UM/Application.py

+++ b/UM/Application.py

@@ -5,6 +5,7 @@ import argparse

 import os

 import sys

 import threading

+import locale

 from UM.Controller import Controller

 from UM.Message import Message #For typing.

@@ -77,7 +78,7 @@ class Application:

         self._main_thread = threading.current_thread()  # type: threading.Thread

         self.default_theme = self._app_name  # type: str # Default theme is the application name

-        self._default_language = "en_US"  # type: str

+        self._default_language = locale.getdefaultlocale()[0]  # type: str

         self.change_log_url = "https://github.com/Ultimaker/Uranium"  # Where to find a more detailed description of the recent updates.