diff --git a/fairmq/tools/Process.cxx b/fairmq/tools/Process.cxx
index 4ae4a118..ac19aab8 100644
--- a/fairmq/tools/Process.cxx
+++ b/fairmq/tools/Process.cxx
@@ -11,6 +11,7 @@
 #include <boost/process.hpp>
 
 #include <iostream>
+#include <sstream>
 
 using namespace std;