diff --git a/dlls/comcat/comcat_private.h b/dlls/comcat/comcat_private.h
index 7e02b9f6cf3..d0045d2c45b 100644
--- a/dlls/comcat/comcat_private.h
+++ b/dlls/comcat/comcat_private.h
@@ -31,6 +31,8 @@
 #include "comcat.h"
 #include "wine/unicode.h"
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /**********************************************************************
  * Dll lifetime tracking declaration for comcat.dll
  */
diff --git a/dlls/dmband/dmutils.h b/dlls/dmband/dmutils.h
index c8651619d7b..3acf8ec97d7 100644
--- a/dlls/dmband/dmutils.h
+++ b/dlls/dmband/dmutils.h
@@ -27,6 +27,8 @@ typedef struct _DMUS_PRIVATE_CHUNK {
 	DWORD dwSize; /* size of the chunk */
 } DMUS_PRIVATE_CHUNK, *LPDMUS_PRIVATE_CHUNK;
 
+#define ICOM_THIS_MULTI(impl,field,iface)  impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /**
  * Parsing utilities
  */
diff --git a/dlls/dmcompos/dmcompos_private.h b/dlls/dmcompos/dmcompos_private.h
index 34e3db3ed24..598a4f260d0 100644
--- a/dlls/dmcompos/dmcompos_private.h
+++ b/dlls/dmcompos/dmcompos_private.h
@@ -267,6 +267,8 @@ typedef struct {
 #define FE(x) { x, #x }	
 #define GE(x) { &x, #x }
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /* check whether the given DWORD is even (return 0) or odd (return 1) */
 extern int even_or_odd (DWORD number);
 /* FOURCC to string conversion for debug messages */
diff --git a/dlls/dmime/dmutils.h b/dlls/dmime/dmutils.h
index c8651619d7b..3acf8ec97d7 100644
--- a/dlls/dmime/dmutils.h
+++ b/dlls/dmime/dmutils.h
@@ -27,6 +27,8 @@ typedef struct _DMUS_PRIVATE_CHUNK {
 	DWORD dwSize; /* size of the chunk */
 } DMUS_PRIVATE_CHUNK, *LPDMUS_PRIVATE_CHUNK;
 
+#define ICOM_THIS_MULTI(impl,field,iface)  impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /**
  * Parsing utilities
  */
diff --git a/dlls/dmloader/dmloader_private.h b/dlls/dmloader/dmloader_private.h
index 6e29428bbbb..32665114cc8 100644
--- a/dlls/dmloader/dmloader_private.h
+++ b/dlls/dmloader/dmloader_private.h
@@ -41,6 +41,8 @@
 #include "dmusicf.h"
 #include "dmusics.h"
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /* dmloader.dll global (for DllCanUnloadNow) */
 extern DWORD dwDirectMusicLoader; /* number of DirectMusicLoader(CF) instances */
 extern DWORD dwDirectMusicContainer; /* number of DirectMusicContainer(CF) instances */
diff --git a/dlls/dmscript/dmscript_private.h b/dlls/dmscript/dmscript_private.h
index ab2b189a268..51f1c1cb3cf 100644
--- a/dlls/dmscript/dmscript_private.h
+++ b/dlls/dmscript/dmscript_private.h
@@ -200,6 +200,8 @@ typedef struct {
 #define FE(x) { x, #x }	
 #define GE(x) { &x, #x }
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /* check whether the given DWORD is even (return 0) or odd (return 1) */
 extern int even_or_odd (DWORD number);
 /* FOURCC to string conversion for debug messages */
diff --git a/dlls/dmstyle/dmutils.h b/dlls/dmstyle/dmutils.h
index c8651619d7b..3acf8ec97d7 100644
--- a/dlls/dmstyle/dmutils.h
+++ b/dlls/dmstyle/dmutils.h
@@ -27,6 +27,8 @@ typedef struct _DMUS_PRIVATE_CHUNK {
 	DWORD dwSize; /* size of the chunk */
 } DMUS_PRIVATE_CHUNK, *LPDMUS_PRIVATE_CHUNK;
 
+#define ICOM_THIS_MULTI(impl,field,iface)  impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /**
  * Parsing utilities
  */
diff --git a/dlls/dmusic/dmusic_private.h b/dlls/dmusic/dmusic_private.h
index 6562df80fe4..d6683a63c47 100644
--- a/dlls/dmusic/dmusic_private.h
+++ b/dlls/dmusic/dmusic_private.h
@@ -412,8 +412,8 @@ void register_waveport (LPGUID lpGUID, LPCSTR lpszDesc, LPCSTR lpszDrvName, LPVO
  * Misc.
  */
 /* my custom ICOM stuff */
-#define ICOM_NAME(impl,iface,name)    impl* const name=(impl*)(iface)
 #define ICOM_NAME_MULTI(impl,field,iface,name)  impl* const name=(impl*)((char*)(iface) - offsetof(impl,field))
+#define ICOM_THIS_MULTI(impl,field,iface) ICOM_NAME_MULTI(impl,field,iface,This)
  
 /* for simpler reading */
 typedef struct _DMUS_PRIVATE_CHUNK {
diff --git a/dlls/dswave/dswave_private.h b/dlls/dswave/dswave_private.h
index d690900be22..93bfc7638c0 100644
--- a/dlls/dswave/dswave_private.h
+++ b/dlls/dswave/dswave_private.h
@@ -160,6 +160,8 @@ typedef struct {
 #define FE(x) { x, #x }	
 #define GE(x) { &x, #x }
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /* check whether the given DWORD is even (return 0) or odd (return 1) */
 extern int even_or_odd (DWORD number);
 /* FOURCC to string conversion for debug messages */
diff --git a/dlls/mlang/mlang.c b/dlls/mlang/mlang.c
index 2242a079cf6..7eb2d235b8a 100644
--- a/dlls/mlang/mlang.c
+++ b/dlls/mlang/mlang.c
@@ -45,6 +45,8 @@ WINE_DEFAULT_DEBUG_CHANNEL(mlang);
 
 #define CP_UNICODE 1200
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 static HRESULT MultiLanguage_create(IUnknown *pUnkOuter, LPVOID *ppObj);
 
 /* FIXME:
diff --git a/dlls/ole32/compobj_private.h b/dlls/ole32/compobj_private.h
index d69d1796643..ee4e33b4c58 100644
--- a/dlls/ole32/compobj_private.h
+++ b/dlls/ole32/compobj_private.h
@@ -189,4 +189,6 @@ static inline APARTMENT* COM_CurrentApt(void)
 APARTMENT* COM_CreateApartment(DWORD model);
 HWND COM_GetApartmentWin(OXID oxid);
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 #endif /* __WINE_OLE_COMPOBJ_H */
diff --git a/dlls/oleaut32/tmarshal.c b/dlls/oleaut32/tmarshal.c
index 14f1975fb92..44b7a68b2d1 100644
--- a/dlls/oleaut32/tmarshal.c
+++ b/dlls/oleaut32/tmarshal.c
@@ -53,6 +53,8 @@ static const WCHAR ppvObjectW[] = {'p','p','v','O','b','j','e','c','t',0};
 WINE_DEFAULT_DEBUG_CHANNEL(ole);
 WINE_DECLARE_DEBUG_CHANNEL(olerelay);
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 typedef struct _marshal_state {
     LPBYTE	base;
     int		size;
diff --git a/dlls/quartz/quartz_private.h b/dlls/quartz/quartz_private.h
index bdda4be8101..1cdb59af4fd 100644
--- a/dlls/quartz/quartz_private.h
+++ b/dlls/quartz/quartz_private.h
@@ -37,6 +37,8 @@
 #define BYTES_FROM_MEDIATIME(time) SEC_FROM_MEDIATIME(time)
 #define MSEC_FROM_MEDIATIME(time) ((time) / 10000)
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 HRESULT FILTERGRAPH_create(IUnknown *pUnkOuter, LPVOID *ppObj) ;
 HRESULT FilterMapper2_create(IUnknown *pUnkOuter, LPVOID *ppObj);
 HRESULT AsyncReader_create(IUnknown * pUnkOuter, LPVOID * ppv);
diff --git a/dlls/rpcrt4/cproxy.c b/dlls/rpcrt4/cproxy.c
index 81c1e78fe7f..10639cbfedf 100644
--- a/dlls/rpcrt4/cproxy.c
+++ b/dlls/rpcrt4/cproxy.c
@@ -55,6 +55,8 @@ typedef struct {
 
 static IRpcProxyBufferVtbl StdProxy_Vtbl;
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 /* How the Windows stubless proxy thunks work is explained at
  * http://msdn.microsoft.com/library/en-us/dnmsj99/html/com0199.asp,
  * but I'll use a slightly different method, to make life easier */
diff --git a/dlls/urlmon/urlmon_main.h b/dlls/urlmon/urlmon_main.h
index 4544ab47c42..141e8ac2fde 100644
--- a/dlls/urlmon/urlmon_main.h
+++ b/dlls/urlmon/urlmon_main.h
@@ -26,4 +26,6 @@
 
 extern HINSTANCE URLMON_hInstance;
 
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
+
 #endif /* __WINE_URLMON_MAIN_H */
diff --git a/include/objbase.h b/include/objbase.h
index c39f714c99d..b825f51c4bc 100644
--- a/include/objbase.h
+++ b/include/objbase.h
@@ -298,7 +298,6 @@
 /* Wine-specific macros */
 
 #define ICOM_THIS(impl,iface)    impl* const This=(impl*)(iface)
-#define ICOM_THIS_MULTI(impl,field,iface)  impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
 
 #include <objidl.h>