diff --git a/vcg/complex/algorithms/update/curvature.h b/vcg/complex/algorithms/update/curvature.h
index 8f9c5440..c2cac5c0 100644
--- a/vcg/complex/algorithms/update/curvature.h
+++ b/vcg/complex/algorithms/update/curvature.h
@@ -68,7 +68,7 @@ the vertex
 #include <vcg/complex/algorithms/intersection.h>
 #include <vcg/complex/algorithms/inertia.h>
 #include <vcg/math/matrix33.h>
-
+#include <wrap/callback.h>
 
 namespace vcg {
 namespace tri {