diff --git a/src/Unittests/unittests_vector_type.cc b/src/Unittests/unittests_vector_type.cc
index bdb70c4e..07908a91 100644
--- a/src/Unittests/unittests_vector_type.cc
+++ b/src/Unittests/unittests_vector_type.cc
@@ -2,6 +2,7 @@
 #include <Unittests/unittests_common.hh>
 #include <iostream>
 #include <list>
+#include <cstdint>
 
 namespace {