diff --git a/dlls/dmime/dmime_private.h b/dlls/dmime/dmime_private.h
index d3ad0e5956b..15889fba385 100644
--- a/dlls/dmime/dmime_private.h
+++ b/dlls/dmime/dmime_private.h
@@ -65,21 +65,21 @@ typedef struct IDirectMusicWaveTrack IDirectMusicWaveTrack;
 /*****************************************************************************
  * ClassFactory
  */
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicPerformanceImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicSegmentImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicSegmentStateImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicGraphImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicAudioPathImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter);
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicPerformanceImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicSegmentImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicSegmentStateImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicGraphImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicAudioPathImpl (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
 
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicLyricsTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicMarkerTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicParamControlTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicSegTriggerTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicSeqTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicSysExTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicTempoTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicTimeSigTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
-extern HRESULT WINAPI DMUSIC_CreateDirectMusicWaveTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter);
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicLyricsTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicMarkerTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicParamControlTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicSegTriggerTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicSeqTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicSysExTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicTempoTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicTimeSigTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
+extern HRESULT WINAPI DMUSIC_CreateDirectMusicWaveTrack (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) DECLSPEC_HIDDEN;
 
 
 /*****************************************************************************
@@ -366,7 +366,7 @@ struct IDirectMusicWaveTrack {
 /**********************************************************************
  * Dll lifetime tracking declaration for dmime.dll
  */
-extern LONG DMIME_refCount;
+extern LONG DMIME_refCount DECLSPEC_HIDDEN;
 static inline void DMIME_LockModule(void) { InterlockedIncrement( &DMIME_refCount ); }
 static inline void DMIME_UnlockModule(void) { InterlockedDecrement( &DMIME_refCount ); }
 
diff --git a/dlls/dmime/dmutils.h b/dlls/dmime/dmutils.h
index 8a2b6e6428c..9f2f98ee4e3 100644
--- a/dlls/dmime/dmutils.h
+++ b/dlls/dmime/dmutils.h
@@ -32,9 +32,9 @@ typedef struct _DMUS_PRIVATE_CHUNK {
 /**
  * Parsing utilities
  */
-extern HRESULT IDirectMusicUtils_IPersistStream_ParseDescGeneric (DMUS_PRIVATE_CHUNK* pChunk, IStream* pStm, LPDMUS_OBJECTDESC pDesc);
-extern HRESULT IDirectMusicUtils_IPersistStream_ParseUNFOGeneric (DMUS_PRIVATE_CHUNK* pChunk, IStream* pStm, LPDMUS_OBJECTDESC pDesc);
-extern HRESULT IDirectMusicUtils_IPersistStream_ParseReference (LPPERSISTSTREAM iface, DMUS_PRIVATE_CHUNK* pChunk, IStream* pStm, IDirectMusicObject** ppObject);
+extern HRESULT IDirectMusicUtils_IPersistStream_ParseDescGeneric (DMUS_PRIVATE_CHUNK* pChunk, IStream* pStm, LPDMUS_OBJECTDESC pDesc) DECLSPEC_HIDDEN;
+extern HRESULT IDirectMusicUtils_IPersistStream_ParseUNFOGeneric (DMUS_PRIVATE_CHUNK* pChunk, IStream* pStm, LPDMUS_OBJECTDESC pDesc) DECLSPEC_HIDDEN;
+extern HRESULT IDirectMusicUtils_IPersistStream_ParseReference (LPPERSISTSTREAM iface, DMUS_PRIVATE_CHUNK* pChunk, IStream* pStm, IDirectMusicObject** ppObject) DECLSPEC_HIDDEN;
 
 /**
  * Debug utilities
@@ -61,11 +61,11 @@ typedef struct {
 #define GE(x) { &x, #x }
 
 /* FOURCC to string conversion for debug messages */
-extern const char *debugstr_fourcc (DWORD fourcc);
+extern const char *debugstr_fourcc (DWORD fourcc) DECLSPEC_HIDDEN;
 /* returns name of given GUID */
-extern const char *debugstr_dmguid (const GUID *id);
+extern const char *debugstr_dmguid (const GUID *id) DECLSPEC_HIDDEN;
 
 /* dump whole DMUS_OBJECTDESC struct */
-extern const char *debugstr_DMUS_OBJECTDESC (LPDMUS_OBJECTDESC pDesc);
+extern const char *debugstr_DMUS_OBJECTDESC (LPDMUS_OBJECTDESC pDesc) DECLSPEC_HIDDEN;
 
 #endif /* __WINE_DMUTILS_H */