diff --git a/Number_types/test/Number_types/known_bit_size_integers.cpp b/Number_types/test/Number_types/known_bit_size_integers.cpp
index 351ffa412af..1bd3f85f920 100644
--- a/Number_types/test/Number_types/known_bit_size_integers.cpp
+++ b/Number_types/test/Number_types/known_bit_size_integers.cpp
@@ -1,5 +1,5 @@
 #include <iostream>
-#include <boost/cstdint.hpp>
+#include <cstdint>
 #include <CGAL/assertions.h>
 
 int main()