diff --git a/vcg/space/index/kdtree/kdtree.h b/vcg/space/index/kdtree/kdtree.h
index edb22279..4d7e07fe 100755
--- a/vcg/space/index/kdtree/kdtree.h
+++ b/vcg/space/index/kdtree/kdtree.h
@@ -31,7 +31,7 @@
 #include <vector>
 #include <limits>
 #include <iostream>
-//#include <cstdint>
+#include <cstdint>
 
 namespace vcg {