diff --git a/django_sendfile/sendfile.py b/django_sendfile/sendfile.py
index e361418..08bc698 100644
--- a/django_sendfile/sendfile.py
+++ b/django_sendfile/sendfile.py
@@ -15,7 +15,7 @@
 def _get_sendfile():
     backend = getattr(settings, 'SENDFILE_BACKEND', None)
     if not backend:
-        raise ImproperlyConfigured('You ust specify a value for SENDFILE_BACKEND')
+        raise ImproperlyConfigured('You must specify a value for SENDFILE_BACKEND')
     module = import_module(backend)
     return module.sendfile