diff --git a/pillar/__init__.py b/pillar/__init__.py
index 22a3a4b2..2f149659 100644
--- a/pillar/__init__.py
+++ b/pillar/__init__.py
@@ -225,12 +225,13 @@ class PillarServer(Eve):
         eve_settings = pillar_extension.eve_settings()
 
         if 'DOMAIN' in eve_settings:
-            pillar_ext_prefix = pillar_extension.name + '.'
+            pillar_ext_prefix = pillar_extension.name + '_'
+            pillar_url_prefix = pillar_extension.name + '/'
             for key, collection in eve_settings['DOMAIN'].items():
                 assert key.startswith(pillar_ext_prefix), \
                     'Eve collection names of %s MUST start with %r' % \
                     (pillar_extension.name, pillar_ext_prefix)
-                url = key.replace('.', '/')
+                url = key.replace(pillar_ext_prefix, pillar_url_prefix)
 
                 collection.setdefault('datasource', {}).setdefault('source', key)
                 collection.setdefault('url', url)