diff --git a/include/utils.hpp b/include/utils.hpp
index eea12de..1024307 100644
--- a/include/utils.hpp
+++ b/include/utils.hpp
@@ -14,6 +14,7 @@
 #include <string>
 #include <vector>
 #include <iomanip>
+#include <sstream>
 
 /** @def DEBUG(msg)
  *  @brief Writes a debug message
diff --git a/latex/assignment-2.pdf b/latex/assignment-2.pdf
index a5c8109..f930a36 100644
Binary files a/latex/assignment-2.pdf and b/latex/assignment-2.pdf differ