diff --git a/M17Utils.cpp b/M17Utils.cpp
index 4462c9b..a65ca13 100644
--- a/M17Utils.cpp
+++ b/M17Utils.cpp
@@ -20,6 +20,7 @@
 #include "M17Defines.h"
 
 #include <cassert>
+#include <cstdint>
 
 const std::string M17_CHARS = " ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/.";