diff --git a/conf.hpp b/conf.hpp
index 8a9ea38..796f80e 100644
--- a/conf.hpp
+++ b/conf.hpp
@@ -3,6 +3,7 @@
 #include "pid/ec/pid.hpp"
 #include "pid/ec/stepwise.hpp"
 
+#include <cstdint>
 #include <limits>
 #include <map>
 #include <string>