diff --git a/contrib/UnwrapComp/src/relaxIVdriver.cpp b/contrib/UnwrapComp/src/relaxIVdriver.cpp
index afbbd90..9f9803b 100644
--- a/contrib/UnwrapComp/src/relaxIVdriver.cpp
+++ b/contrib/UnwrapComp/src/relaxIVdriver.cpp
@@ -2,6 +2,9 @@
 #include <sstream>
 #include <RelaxIV.h>
 #include <relaxIVdriver.h>
+#include <MCFClass.h>
+
+using namespace MCFClass_di_unipi_it;
 
 template<class T>
 inline T ABS( const T x )