diff --git a/src/CLineParser.cpp b/src/CLineParser.cpp
index a7afaba..2efb692 100644
--- a/src/CLineParser.cpp
+++ b/src/CLineParser.cpp
@@ -23,6 +23,7 @@
 #include <cstdlib>
 #include <string>
 #include <vector>
+#include <iostream>
 
 namespace po = boost::program_options;
 using namespace monicelli;