diff --git a/vcg/simplex/face/topology.h b/vcg/simplex/face/topology.h
index caceccc9..8715e358 100644
--- a/vcg/simplex/face/topology.h
+++ b/vcg/simplex/face/topology.h
@@ -108,7 +108,10 @@ minor changes
 
 #ifndef _VCG_FACE_TOPOLOGY
 #define _VCG_FACE_TOPOLOGY
+
 #include <vcg/simplex/face/pos.h>
+#include <algorithm>
+
 namespace vcg {
 namespace face {
 /** \addtogroup face */