diff --git a/Core/FileSystems/FileSystem.h b/Core/FileSystems/FileSystem.h
index 9e64d16f20..e98fb36300 100644
--- a/Core/FileSystems/FileSystem.h
+++ b/Core/FileSystems/FileSystem.h
@@ -20,6 +20,7 @@
 #include <vector>
 #include <string>
 #include <cstring>
+#include <cstdint>
 #include <ctime>
 
 #include "Common.h"