diff --git a/vcg/complex/complex.h b/vcg/complex/complex.h
index f8745bca..fa494bd9 100644
--- a/vcg/complex/complex.h
+++ b/vcg/complex/complex.h
@@ -51,7 +51,7 @@
 #include <vcg/simplex/edge/pos.h>
 #include <vcg/simplex/edge/topology.h>
 #include <vcg/simplex/tetrahedron/pos.h>
-// #include <vcg/simplex/tetrahedron/topology.h>
+#include <vcg/simplex/tetrahedron/topology.h>
 #include <vcg/complex/foreach.h>
 #include <vcg/complex/algorithms/update/flag.h>
 #include <vcg/complex/algorithms/update/selection.h>