diff --git a/vcg/complex/algorithms/local_optimization.h b/vcg/complex/algorithms/local_optimization.h
index e72f3420..b86edc35 100644
--- a/vcg/complex/algorithms/local_optimization.h
+++ b/vcg/complex/algorithms/local_optimization.h
@@ -23,8 +23,8 @@
 
 #ifndef __VCGLIB_LOCALOPTIMIZATION
 #define __VCGLIB_LOCALOPTIMIZATION
-#include<vcg/complex/complex.h>
-
+#include <vcg/complex/complex.h>
+#include <time.h>
 namespace vcg{
 // Base class for Parameters
 // all parameters must be derived from this.