diff --git a/vcg/complex/local_optimization/tri_edge_collapse_quadric.h b/vcg/complex/local_optimization/tri_edge_collapse_quadric.h
index 1b22241e..409fd4fb 100644
--- a/vcg/complex/local_optimization/tri_edge_collapse_quadric.h
+++ b/vcg/complex/local_optimization/tri_edge_collapse_quadric.h
@@ -77,6 +77,7 @@ corrected error in -error (see localoptimization)
 #include<vcg/math/quadric.h>
 #include<vcg/simplex/face/pos.h>
 #include<vcg/complex/trimesh/update/flag.h>
+#include<vcg/complex/trimesh/update/topology.h>
 #include<vcg/complex/trimesh/update/bounding.h>
 #include<vcg/complex/local_optimization/tri_edge_collapse.h>
 #include<vcg/complex/local_optimization.h>