diff --git a/dcorch/api/proxy/apps/acceptor.py b/dcorch/api/proxy/apps/acceptor.py
index df485b2b3..66fa8a391 100644
--- a/dcorch/api/proxy/apps/acceptor.py
+++ b/dcorch/api/proxy/apps/acceptor.py
@@ -131,4 +131,4 @@ class VersionAcceptor(Router):
         api_controller = VersionController(app, conf)
         mapper.connect(proxy_consts.VERSION_ROOT, controller=api_controller,
                        conditions=dict(method=['GET']))
-        super(VersionAcceptor, self).__init__(app, conf, mapper, None)
+        super(VersionAcceptor, self).__init__(app, conf, mapper, app)
diff --git a/dcorch/api/proxy/common/constants.py b/dcorch/api/proxy/common/constants.py
index d5074fad2..1249f3d0b 100755
--- a/dcorch/api/proxy/common/constants.py
+++ b/dcorch/api/proxy/common/constants.py
@@ -15,7 +15,9 @@
 
 from dcorch.common import consts
 
-VERSION_ROOT = '/{version:.*?}'
+# Version could be any of the following: /, /v1, /v1/
+# but must deny regular paths such as /v1/isystems
+VERSION_ROOT = '/{version:[^/]*?(\/$)?}'
 
 # Compute
 FLAVOR_RESOURCE_TAG = 'flavors'