diff --git a/include/xact.h b/include/xact.h
index 03a354e69a9..c6b34cc2c05 100644
--- a/include/xact.h
+++ b/include/xact.h
@@ -708,7 +708,7 @@ DECLARE_INTERFACE(IXACTWaveBank)
 #define INTERFACE IXACTEngine
 DECLARE_INTERFACE_(IXACTEngine,IUnknown)
 {
-    STDMETHOD_(HRESULT,QueryInterface)(THIS_ REFIID iid, void **out) PURE;
+    STDMETHOD(QueryInterface)(THIS_ REFIID iid, void **out) PURE;
     STDMETHOD_(ULONG,AddRef)(THIS) PURE;
     STDMETHOD_(ULONG,Release)(THIS) PURE;
     STDMETHOD(GetRendererCount)(THIS_ XACTINDEX *count) PURE;
diff --git a/include/xact3.h b/include/xact3.h
index 99fd8dcea5b..939a80e2af5 100644
--- a/include/xact3.h
+++ b/include/xact3.h
@@ -664,7 +664,7 @@ DECLARE_INTERFACE(IXACT3WaveBank)
 DECLARE_INTERFACE_(IXACT3Engine,IUnknown)
 {
     /*** IUnknown methods ***/
-    STDMETHOD_(HRESULT,QueryInterface)(THIS_ REFIID riid, void** ppvObject) PURE;
+    STDMETHOD(QueryInterface)(THIS_ REFIID riid, void** ppvObject) PURE;
     STDMETHOD_(ULONG,AddRef)(THIS) PURE;
     STDMETHOD_(ULONG,Release)(THIS) PURE;
     /*** IXACT3Engine methods ***/