diff --git a/calendarweek/django.py b/calendarweek/django.py
index d9d72a0631f92c7aa5cfda446f03d02aec3818d0..331e45db6454bfdf6d9d7533afbb0652621844e9 100644
--- a/calendarweek/django.py
+++ b/calendarweek/django.py
@@ -17,6 +17,7 @@ import json
 import locale
 from typing import Any, List, Optional, Tuple
 
+from django.conf import settings
 from django.http import HttpRequest, HttpResponse
 from django.utils.encoding import DEFAULT_LOCALE_ENCODING
 from django.utils.functional import lazy
@@ -29,7 +30,7 @@ def i18n_day_names(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of day names for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language())
+        loc = to_locale(get_language() or settings.LANGUAGE_CODE)
 
     try:
         return CalendarWeek.day_names(loc)
@@ -41,7 +42,7 @@ def i18n_day_abbrs(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of day name abbreviations for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language())
+        loc = to_locale(get_language() or settings.LANGUAGE_CODE)
 
     try:
         return CalendarWeek.day_abbrs(loc)
@@ -53,7 +54,7 @@ def i18n_month_names(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of month names for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language())
+        loc = to_locale(get_language() or settings.LANGUAGE_CODE)
 
     try:
         return CalendarWeek.month_names(loc)
@@ -65,7 +66,7 @@ def i18n_month_abbrs(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of month name abbreviations for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language())
+        loc = to_locale(get_language() or settings.LANGUAGE_CODE)
 
     try:
         return CalendarWeek.month_abbrs(loc)