diff --git a/dlls/dmscript/dmscript_main.c b/dlls/dmscript/dmscript_main.c
index 7191129f96d..f6785176aec 100644
--- a/dlls/dmscript/dmscript_main.c
+++ b/dlls/dmscript/dmscript_main.c
@@ -42,10 +42,10 @@ LONG DMSCRIPT_refCount = 0;
 
 typedef struct {
         IClassFactory IClassFactory_iface;
-        HRESULT WINAPI (*fnCreateInstance)(REFIID riid, void **ppv, IUnknown *pUnkOuter);
+        HRESULT (*fnCreateInstance)(REFIID riid, void **ppv, IUnknown *pUnkOuter);
 } IClassFactoryImpl;
 
-static HRESULT WINAPI create_unimpl_instance(REFIID riid, void **ppv, IUnknown *pUnkOuter)
+static HRESULT create_unimpl_instance(REFIID riid, void **ppv, IUnknown *pUnkOuter)
 {
         FIXME("(%p, %s, %p) stub\n", pUnkOuter, debugstr_dmguid(riid), ppv);
 
diff --git a/dlls/dmscript/dmscript_private.h b/dlls/dmscript/dmscript_private.h
index a6723e36aa1..3b3a4c86c84 100644
--- a/dlls/dmscript/dmscript_private.h
+++ b/dlls/dmscript/dmscript_private.h
@@ -44,9 +44,9 @@
 /*****************************************************************************
  * ClassFactory
  */
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicScriptImpl (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT DMUSIC_CreateDirectMusicScriptImpl(REFIID riid, void **ppobj, IUnknown *pUnkOuter) DECLSPEC_HIDDEN;
 
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicScriptTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT DMUSIC_CreateDirectMusicScriptTrack(REFIID riid, void **ppobj, IUnknown *pUnkOuter) DECLSPEC_HIDDEN;
 
 /**********************************************************************
  * Dll lifetime tracking declaration for dmscript.dll
diff --git a/dlls/dmscript/script.c b/dlls/dmscript/script.c
index 5bc6a8b3067..375eebf69aa 100644
--- a/dlls/dmscript/script.c
+++ b/dlls/dmscript/script.c
@@ -488,7 +488,7 @@ static const IPersistStreamVtbl persiststream_vtbl = {
 };
 
 /* for ClassFactory */
-HRESULT WINAPI DMUSIC_CreateDirectMusicScriptImpl(REFIID lpcGUID, void **ppobj, IUnknown *pUnkOuter)
+HRESULT DMUSIC_CreateDirectMusicScriptImpl(REFIID lpcGUID, void **ppobj, IUnknown *pUnkOuter)
 {
   IDirectMusicScriptImpl *obj;
   HRESULT hr;
diff --git a/dlls/dmscript/scripttrack.c b/dlls/dmscript/scripttrack.c
index 6e430de3f39..fbe454c09e5 100644
--- a/dlls/dmscript/scripttrack.c
+++ b/dlls/dmscript/scripttrack.c
@@ -317,8 +317,7 @@ static const IPersistStreamVtbl persist_vtbl = {
 };
 
 /* for ClassFactory */
-HRESULT WINAPI DMUSIC_CreateDirectMusicScriptTrack(REFIID riid, void **ret_iface,
-        IUnknown *pUnkOuter)
+HRESULT DMUSIC_CreateDirectMusicScriptTrack(REFIID riid, void **ret_iface, IUnknown *pUnkOuter)
 {
     DirectMusicScriptTrack *track;
     HRESULT hr;