diff --git a/include/epu_impl.hpp b/include/epu_impl.hpp
index b25ac9b5..136915c6 100644
--- a/include/epu_impl.hpp
+++ b/include/epu_impl.hpp
@@ -19,6 +19,7 @@
 #include <initializer_list>
 #include <iostream>
 #include <random>
+#include <sstream>
 
 #include "vect_generic.hpp"