diff --git a/src/win32/HResult.hxx b/src/win32/HResult.hxx
index e61447fb6..9bf612727 100644
--- a/src/win32/HResult.hxx
+++ b/src/win32/HResult.hxx
@@ -50,6 +50,8 @@ case x:
 		C(AUDCLNT_E_SERVICE_NOT_RUNNING);
 		C(AUDCLNT_E_UNSUPPORTED_FORMAT);
 		C(AUDCLNT_E_WRONG_ENDPOINT_TYPE);
+		C(AUDCLNT_E_NOT_INITIALIZED);
+		C(AUDCLNT_E_NOT_STOPPED);
 		C(CO_E_NOTINITIALIZED);
 		C(E_INVALIDARG);
 		C(E_OUTOFMEMORY);