diff --git a/stackinabox/util/requests_mock/core.py b/stackinabox/util/requests_mock/core.py
index 0dd9208..d49c706 100644
--- a/stackinabox/util/requests_mock/core.py
+++ b/stackinabox/util/requests_mock/core.py
@@ -17,7 +17,6 @@
 from requests.adapters import HTTPAdapter
 from urllib3.response import HTTPResponse
 import requests_mock
-import requests_mock.compat
 import requests_mock.response
 import six
 
@@ -25,6 +24,11 @@
 from stackinabox.util import deprecator
 from stackinabox.util.requests_mock import reqcallable
 
+try:
+    import requests_mock.compat
+except ImportError:
+    pass
+
 
 logger = logging.getLogger(__name__)
 
@@ -52,6 +56,9 @@ def session_registration(uri, session):
         reqcallable.RequestMockCallable(uri)
     )
 
+    if not uri.endswith('/'):
+        uri += '/'
+
     # Tell the session about the adapter and the URI
     session.mount('http://{0}'.format(uri), StackInABox.hold_out('adapter'))
     session.mount('https://{0}'.format(uri), StackInABox.hold_out('adapter'))