diff --git a/webservice/MCPermissions.cs b/webservice/MCPermissions.cs
index 1d9a2f1..8d466f1 100644
--- a/webservice/MCPermissions.cs
+++ b/webservice/MCPermissions.cs
@@ -141,7 +141,7 @@
             }
         }
 
-        private XmlNode PopulateResponse(SPSecurableObject item)
+        private XmlNode PopulateResponse(ISecurableObject item)
         {
             XmlNode retVal = null;
             if (item.RoleAssignments.Count > 0)