diff --git a/django_mailgun/__init__.py b/django_mailgun/__init__.py
index 9e271ad..33ad09e 100644
--- a/django_mailgun/__init__.py
+++ b/django_mailgun/__init__.py
@@ -4,12 +4,12 @@
 from django.core.mail.message import sanitize_address
 
 try:
-    from cStringIO import StringIO
+    from io import StringIO
 except ImportError:
     try:
-        from StringIO import StringIO
+        from cStringIO import StringIO
     except ImportError:
-        from io import StringIO
+        from StringIO import StringIO
 
 class MailgunAPIError(Exception):
     pass