diff --git a/sat/core/sat_main.py b/sat/core/sat_main.py
index 656f4c1a..954c3cf9 100644
--- a/sat/core/sat_main.py
+++ b/sat/core/sat_main.py
@@ -872,6 +872,7 @@ class SAT(service.Service):
         found_roster = {}
         if service:
             services_jids = yield self.findFeaturesSet(client, namespaces)
+            services_jids = list(services_jids)  # we need a list to map results below
             services_infos  = yield defer.DeferredList(
                 [self.getDiscoInfos(client, service_jid) for service_jid in services_jids]
             )