diff --git a/solanaceae/toxcore/tox_key.cpp b/solanaceae/toxcore/tox_key.cpp
index f2159ad..aa951bc 100644
--- a/solanaceae/toxcore/tox_key.cpp
+++ b/solanaceae/toxcore/tox_key.cpp
@@ -1,5 +1,6 @@
 #include "./tox_key.hpp"
 
+#include <cstdint>
 #include <cassert>
 
 ToxKey::ToxKey(const std::vector<std::uint8_t>& v) {