diff --git a/Samples/D3D12nBodyGravity/src/stdafx.h b/Samples/D3D12nBodyGravity/src/stdafx.h
index fddb46128..2eb16e10d 100644
--- a/Samples/D3D12nBodyGravity/src/stdafx.h
+++ b/Samples/D3D12nBodyGravity/src/stdafx.h
@@ -29,5 +29,6 @@
 #include <pix3.h>
 
 #include <wrl.h>
+#include <string>
 #include <vector>
 #include <shellapi.h>