--- a/plugins/systemvolume/PolicyConfig.h
+++ b/plugins/systemvolume/PolicyConfig.h
@@ -51,13 +51,14 @@
 
     virtual HRESULT STDMETHODCALLTYPE SetPropertyValue(PCWSTR, const PROPERTYKEY &, PROPVARIANT *);
 
-    virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(__in PCWSTR wszDeviceId, __in ERole eRole);
+    virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(PCWSTR wszDeviceId, ERole eRole);
 
     virtual HRESULT STDMETHODCALLTYPE SetEndpointVisibility(PCWSTR, INT);
 };
 
 interface DECLSPEC_UUID("568b9108-44bf-40b4-9006-86afe5b5a620") IPolicyConfigVista;
 class DECLSPEC_UUID("294935CE-F637-4E7C-A41B-AB255460B862") CPolicyConfigVistaClient;
+
 // ----------------------------------------------------------------------------
 // class CPolicyConfigVistaClient
 // {294935CE-F637-4E7C-A41B-AB255460B862}
@@ -97,7 +98,7 @@
 
     virtual HRESULT STDMETHODCALLTYPE SetPropertyValue(PCWSTR, const PROPERTYKEY &, PROPVARIANT *);
 
-    virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(__in PCWSTR wszDeviceId, __in ERole eRole);
+    virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(PCWSTR wszDeviceId, ERole eRole);
 
     virtual HRESULT STDMETHODCALLTYPE SetEndpointVisibility(PCWSTR,
                                                             INT); // not available on Windows 7, use method from IPolicyConfig
