diff --git a/gramps/gen/utils/grampslocale.py b/gramps/gen/utils/grampslocale.py
index 83917eeae..95a9d1687 100644
--- a/gramps/gen/utils/grampslocale.py
+++ b/gramps/gen/utils/grampslocale.py
@@ -189,10 +189,12 @@ class GrampsLocale(object):
                     self.lang = loc[0]
                     self.languages = [loc[0]]
                     self.encoding = loc[1]
-                elif ((lang, loc) = _check_mswin_locale(lang)):
-                    self.lang = lang
-                    self.language = [self.lang]
-                    self.encoding = loc[1]
+                else:
+                    (lang, loc) = _check_mswin_locale(lang)
+                    if lang:
+                        self.lang = lang
+                        self.language = [self.lang]
+                        self.encoding = loc[1]
 
             if not self.lang:
                 self.lang = 'C'