diff --git a/src/args.h b/src/args.h
index 3e04d6c..1cbe1dc 100644
--- a/src/args.h
+++ b/src/args.h
@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <istream>
 #include <ostream>
 #include <string>