diff --git a/src/Library/Base64.hpp b/src/Library/Base64.hpp
index 0947f21..0badaf3 100644
--- a/src/Library/Base64.hpp
+++ b/src/Library/Base64.hpp
@@ -22,6 +22,7 @@
   #include <build-config.h>
 #endif
 
+#include <cstdint>
 #include <string>
 #include <cstddef>