diff --git a/udiskie/locale.py b/udiskie/locale.py
index f12bea9..450e38b 100644
--- a/udiskie/locale.py
+++ b/udiskie/locale.py
@@ -10,10 +10,8 @@ from gettext import translation
 testdirs = [
     # manual override:
     os.environ.get('TEXTDOMAINDIR'),
-    # editable installation:
-    os.path.join(os.path.dirname(__file__), '../build/locale'),
-    # user or virtualenv installation:
-    os.path.join(sys.prefix, 'share/locale'),
+    # Nix installation:
+    os.path.join('@out@', 'share/locale'),
 ]
 testfile = 'en_US/LC_MESSAGES/udiskie.mo'
 localedir = next(