diff --git a/weed/server/master_grpc_server_collection.go b/weed/server/master_grpc_server_collection.go
index 23188d856..02a1ee3a7 100644
--- a/weed/server/master_grpc_server_collection.go
+++ b/weed/server/master_grpc_server_collection.go
@@ -19,7 +19,7 @@ func (ms *MasterServer) CollectionList(ctx context.Context, req *master_pb.Colle
 	collections := ms.Topo.ListCollections()
 	for _, c := range collections {
 		resp.Collections = append(resp.Collections, &master_pb.Collection{
-			Name: c.Name,
+			Name: c,
 		})
 	}
 
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index 667846f02..07b70dd9f 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -126,9 +126,21 @@ func (t *Topology) GetVolumeLayout(collectionName string, rp *storage.ReplicaPla
 	}).(*Collection).GetOrCreateVolumeLayout(rp, ttl)
 }
 
-func (t *Topology) ListCollections() (ret []*Collection) {
+func (t *Topology) ListCollections() (ret []string) {
+
+	mapOfCollections := make(map[string]bool)
 	for _, c := range t.collectionMap.Items() {
-		ret = append(ret, c.(*Collection))
+		mapOfCollections[c.(*Collection).Name] = true
+	}
+
+	t.ecShardMapLock.RLock()
+	for _, ecVolumeLocation := range t.ecShardMap {
+		mapOfCollections[ecVolumeLocation.Collection] = true
+	}
+	t.ecShardMapLock.RUnlock()
+
+	for k, _ := range mapOfCollections {
+		ret = append(ret, k)
 	}
 	return ret
 }