sliceplus: return role string instead of role object
diff --git a/planetstack/core/xoslib/objects/sliceplus.py b/planetstack/core/xoslib/objects/sliceplus.py
index 6e586d2..465cbda 100644
--- a/planetstack/core/xoslib/objects/sliceplus.py
+++ b/planetstack/core/xoslib/objects/sliceplus.py
@@ -18,7 +18,7 @@
 
         roles = []
         if (user!=None):
-            roles = [x.role for x in self.sliceprivileges.filter(user=user)]
+            roles = [x.role.role for x in self.sliceprivileges.filter(user=user)]
 
         return {"sitesUsed": used_sites,
                 "deploymentsUsed": used_deployments,