diff --git a/include/crossguid/guid.hpp b/include/crossguid/guid.hpp
index 61e0f17..70966f2 100644
--- a/include/crossguid/guid.hpp
+++ b/include/crossguid/guid.hpp
@@ -29,6 +29,7 @@ THE SOFTWARE.
 #include <jni.h>
 #endif
 
+#include <cstdint>
 #include <functional>
 #include <iostream>
 #include <array>