diff --git a/Source/Core/Common/ChunkFile.h b/Source/Core/Common/ChunkFile.h
index 8e4280e9ab..2c82749599 100644
--- a/Source/Core/Common/ChunkFile.h
+++ b/Source/Core/Common/ChunkFile.h
@@ -25,6 +25,7 @@
 
 #include "Common/Common.h"
 #include "Common/FileUtil.h"
+#include "Common/Flag.h"
 
 // ewww
 #if _LIBCPP_VERSION
@@ -165,6 +166,14 @@ public:
 			Do(x[i]);
 	}
 
+	void Do(Common::Flag& flag)
+	{
+		bool s = flag.IsSet();
+		Do(s);
+		if (mode == MODE_READ)
+			flag.Set(s);
+	}
+
 	template <typename T>
 	void Do(T& x)
 	{