diff --git a/Downward.h b/Downward.h
index 591c95f..01d38db 100644
--- a/Downward.h
+++ b/Downward.h
@@ -76,7 +76,7 @@ public:
 	{
 		unsigned int lid[internal::Topology<Topo>::cellvertices()];
 		vertices(puml, cell, lid);
-		internal::Utils::l2g<Topo, PUML<Topo>::vertex_t, internal::Topology<Topo>::cellvertices()>(puml, lid, gid);
+		internal::Utils::l2g<Topo, typename PUML<Topo>::vertex_t, internal::Topology<Topo>::cellvertices()>(puml, lid, gid);
 	}
 
 	/**