diff --git a/tests/c++/template-recursion.cpp b/tests/c++/template-recursion.cpp
index 9e9e773..4187880 100644
--- a/tests/c++/template-recursion.cpp
+++ b/tests/c++/template-recursion.cpp
@@ -1,6 +1,7 @@
 #include <algorithm>
 #include <cassert>
 #include <cstddef>
+#include <cstdint>
 #include <iterator>
 #include <numeric>
 #include <span>