diff --git a/chatrooms/ajax/chat.py b/chatrooms/ajax/chat.py
index fbfdcf9..2aed5cc 100644
--- a/chatrooms/ajax/chat.py
+++ b/chatrooms/ajax/chat.py
@@ -8,7 +8,7 @@
 from django.conf import settings
 from django.db.models.signals import post_save
 from django.dispatch import receiver
-from django.http import (HttpResponse,
+from ..utils.compat import (HttpResponse,
                         HttpResponseBadRequest)
 from django.utils.decorators import method_decorator
 
diff --git a/chatrooms/utils/compat.py b/chatrooms/utils/compat.py
new file mode 100644
index 0000000..baeb965
--- /dev/null
+++ b/chatrooms/utils/compat.py
@@ -0,0 +1,18 @@
+from django import VERSION
+from django.http import (HttpResponse as BaseHttpResponse,
+                         HttpResponseBadRequest as Base400)
+
+# https://github.com/chicagobuss/graphite-web/commit/842944a34085c4b6bd5f37532118be996a0ff4f1
+class ContentTypeMixin(object):
+    def __init__(self, *args, **kwargs):
+        if VERSION < (1, 5) and 'content_type' in kwargs:
+            kwargs['mimetype'] = kwargs.pop('content_type')
+        elif VERSION > (1, 7) and 'mimetype' in kwargs:
+            kwargs['content_type'] = kwargs.pop('mimetype')
+        super(ContentTypeMixin, self).__init__(*args, **kwargs)
+
+class HttpResponse(ContentTypeMixin, BaseHttpResponse):
+    pass
+
+class HttpResponseBadRequest(ContentTypeMixin, Base400):
+    pass