diff --git a/include/xaudio2.idl b/include/xaudio2.idl
index 4dca60027fb..3ac3e221adb 100644
--- a/include/xaudio2.idl
+++ b/include/xaudio2.idl
@@ -21,6 +21,8 @@ import "mmdeviceapi.idl";
 
 import "audiosessiontypes.h";
 
+cpp_quote("#include <pshpack1.h>")
+
 [
     uuid(5a508685-a254-4fba-9b82-9a24b00306af)
 ]
@@ -593,3 +595,5 @@ cpp_quote("inline static float XAudio2RadiansToCutoffFrequency(float radians, fl
 cpp_quote("#endif")
 
 cpp_quote("HRESULT WINAPI XAudio2Create(IXAudio2** pxaudio2, UINT32 flags, XAUDIO2_PROCESSOR processor);")
+
+cpp_quote("#include <poppack.h>")