diff --git a/csp/middleware.py b/csp/middleware.py
index 0e58024..c354b64 100644
--- a/csp/middleware.py
+++ b/csp/middleware.py
@@ -6,21 +6,9 @@
 from functools import partial
 
 from django.conf import settings
+from django.utils.deprecation import MiddlewareMixin
 from django.utils.functional import SimpleLazyObject
 
-try:
-    from django.utils.deprecation import MiddlewareMixin
-except ImportError:
-
-    class MiddlewareMixin(object):
-        """
-        If this middleware doesn't exist, this is an older version of django
-        and we don't need it.
-        """
-
-        pass
-
-
 from csp.utils import build_policy