diff --git a/CInterface/Core.hpp b/CInterface/Core.hpp
index 4fedb99..f2a7a40 100644
--- a/CInterface/Core.hpp
+++ b/CInterface/Core.hpp
@@ -4,6 +4,7 @@
 #include <Arbutils/Exception.hpp>
 #include <cstring>
 #include <exception>
+#include <sstream>
 #include <string>
 #define export extern "C" [[maybe_unused]]