diff --git a/Release/src/streams/fileio_winrt.cpp b/Release/src/streams/fileio_winrt.cpp
index 1a206b4e74..65723af3b3 100644
--- a/Release/src/streams/fileio_winrt.cpp
+++ b/Release/src/streams/fileio_winrt.cpp
@@ -17,6 +17,7 @@
 ****/
 #include "stdafx.h"
 #include "cpprest/details/fileio.h"
+#include "cpprest/interopstream.h"
 #include "robuffer.h"
 
 using namespace ::Windows::Foundation;