diff --git a/tests/common.h b/tests/common.h
index 70eb8c63a7..ba05879a56 100644
--- a/tests/common.h
+++ b/tests/common.h
@@ -5,6 +5,7 @@
 #include <llama/mapping/tree/toString.hpp>
 #include <numeric>
 #include <regex>
+#include <sstream>
 #include <string>
 #include <typeinfo>