diff --git a/dlls/comctl32/comctl32.h b/dlls/comctl32/comctl32.h
index 2c8e53816d6..872638dc873 100644
--- a/dlls/comctl32/comctl32.h
+++ b/dlls/comctl32/comctl32.h
@@ -175,8 +175,8 @@ typedef struct
 
 /* undocumented functions */
 
-LPVOID WINAPI Alloc (DWORD);
-LPVOID WINAPI ReAlloc (LPVOID, DWORD);
+LPVOID WINAPI Alloc (DWORD) __WINE_ALLOC_SIZE(1);
+LPVOID WINAPI ReAlloc (LPVOID, DWORD) __WINE_ALLOC_SIZE(2);
 BOOL   WINAPI Free (LPVOID);
 DWORD  WINAPI GetSize (LPVOID);
 
diff --git a/dlls/comdlg32/cdlg.h b/dlls/comdlg32/cdlg.h
index d0c0591e5c4..f6a9cbc232d 100644
--- a/dlls/comdlg32/cdlg.h
+++ b/dlls/comdlg32/cdlg.h
@@ -30,7 +30,7 @@
 extern HINSTANCE	COMDLG32_hInstance;
 
 void	COMDLG32_SetCommDlgExtendedError(DWORD err);
-LPVOID	COMDLG32_AllocMem(int size);
+LPVOID	COMDLG32_AllocMem(int size) __WINE_ALLOC_SIZE(1);
 
 /* handle<-handle16 conversion */
 #define HINSTANCE_32(h16)           ((HINSTANCE)(ULONG_PTR)(h16))
diff --git a/dlls/hhctrl.ocx/hhctrl.h b/dlls/hhctrl.ocx/hhctrl.h
index 6f7c96b63c4..f529a595172 100644
--- a/dlls/hhctrl.ocx/hhctrl.h
+++ b/dlls/hhctrl.ocx/hhctrl.h
@@ -141,22 +141,22 @@ BOOL NavigateToChm(HHInfo*,LPCWSTR,LPCWSTR);
 
 /* memory allocation functions */
 
-static inline void *heap_alloc(size_t len)
+static inline void __WINE_ALLOC_SIZE(1) *heap_alloc(size_t len)
 {
     return HeapAlloc(GetProcessHeap(), 0, len);
 }
 
-static inline void *heap_alloc_zero(size_t len)
+static inline void __WINE_ALLOC_SIZE(1) *heap_alloc_zero(size_t len)
 {
     return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, len);
 }
 
-static inline void *heap_realloc(void *mem, size_t len)
+static inline void __WINE_ALLOC_SIZE(2) *heap_realloc(void *mem, size_t len)
 {
     return HeapReAlloc(GetProcessHeap(), 0, mem, len);
 }
 
-static inline void *heap_realloc_zero(void *mem, size_t len)
+static inline void __WINE_ALLOC_SIZE(2) *heap_realloc_zero(void *mem, size_t len)
 {
     return HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, mem, len);
 }
diff --git a/dlls/localspl/localspl_private.h b/dlls/localspl/localspl_private.h
index 7d76429277c..614e10824eb 100644
--- a/dlls/localspl/localspl_private.h
+++ b/dlls/localspl/localspl_private.h
@@ -51,7 +51,7 @@ extern HINSTANCE LOCALSPL_hInstance;
 
 /* ## Memory allocation functions ## */
 
-static inline void *heap_alloc( size_t len )
+static inline void __WINE_ALLOC_SIZE(1) *heap_alloc( size_t len )
 {
     return HeapAlloc( GetProcessHeap(), 0, len );
 }
diff --git a/dlls/mshtml/mshtml_private.h b/dlls/mshtml/mshtml_private.h
index 85329c5587c..4b4675b9854 100644
--- a/dlls/mshtml/mshtml_private.h
+++ b/dlls/mshtml/mshtml_private.h
@@ -490,7 +490,7 @@ void hlink_frame_navigate(HTMLDocument*,IHlinkFrame*,LPCWSTR,nsIInputStream*,DWO
 void call_property_onchanged(ConnectionPoint*,DISPID);
 HRESULT call_set_active_object(IOleInPlaceUIWindow*,IOleInPlaceActiveObject*);
 
-void *nsalloc(size_t);
+void *nsalloc(size_t) __WINE_ALLOC_SIZE(1);
 void nsfree(void*);
 
 void nsACString_Init(nsACString*,const char*);
@@ -654,17 +654,17 @@ extern LONG module_ref;
 
 /* memory allocation functions */
 
-static inline void *heap_alloc(size_t len)
+static inline void __WINE_ALLOC_SIZE(1) *heap_alloc(size_t len)
 {
     return HeapAlloc(GetProcessHeap(), 0, len);
 }
 
-static inline void *heap_alloc_zero(size_t len)
+static inline void __WINE_ALLOC_SIZE(1) *heap_alloc_zero(size_t len)
 {
     return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, len);
 }
 
-static inline void *heap_realloc(void *mem, size_t len)
+static inline void __WINE_ALLOC_SIZE(2) *heap_realloc(void *mem, size_t len)
 {
     return HeapReAlloc(GetProcessHeap(), 0, mem, len);
 }
diff --git a/dlls/msi/msipriv.h b/dlls/msi/msipriv.h
index 2f54ccaf2eb..96656c6445f 100644
--- a/dlls/msi/msipriv.h
+++ b/dlls/msi/msipriv.h
@@ -1040,21 +1040,25 @@ extern const WCHAR cszRootDrive[];
 extern const WCHAR cszbs[];
 
 /* memory allocation macro functions */
+static void *msi_alloc( size_t len ) __WINE_ALLOC_SIZE(1);
 static inline void *msi_alloc( size_t len )
 {
     return HeapAlloc( GetProcessHeap(), 0, len );
 }
 
+static void *msi_alloc_zero( size_t len ) __WINE_ALLOC_SIZE(1);
 static inline void *msi_alloc_zero( size_t len )
 {
     return HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, len );
 }
 
+static void *msi_realloc( void *mem, size_t len ) __WINE_ALLOC_SIZE(2);
 static inline void *msi_realloc( void *mem, size_t len )
 {
     return HeapReAlloc( GetProcessHeap(), 0, mem, len );
 }
 
+static void *msi_realloc_zero( void *mem, size_t len ) __WINE_ALLOC_SIZE(2);
 static inline void *msi_realloc_zero( void *mem, size_t len )
 {
     return HeapReAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, mem, len );
diff --git a/dlls/oleaut32/typelib.c b/dlls/oleaut32/typelib.c
index d7139d23aa6..9c7ef98d72c 100644
--- a/dlls/oleaut32/typelib.c
+++ b/dlls/oleaut32/typelib.c
@@ -1357,6 +1357,8 @@ static void TLB_abort(void)
 {
     DebugBreak();
 }
+
+static void * TLB_Alloc(unsigned size) __WINE_ALLOC_SIZE(1);
 static void * TLB_Alloc(unsigned size)
 {
     void * ret;
diff --git a/dlls/riched20/editor.h b/dlls/riched20/editor.h
index 5e73c97cb45..b9c01b790d5 100644
--- a/dlls/riched20/editor.h
+++ b/dlls/riched20/editor.h
@@ -23,7 +23,7 @@
 
 extern HANDLE me_heap;
 
-static inline void *heap_alloc( size_t len )
+static inline void __WINE_ALLOC_SIZE(1) *heap_alloc( size_t len )
 {
     return HeapAlloc( me_heap, 0, len );
 }
@@ -33,7 +33,7 @@ static inline BOOL heap_free( void *ptr )
     return HeapFree( me_heap, 0, ptr );
 }
 
-static inline void *heap_realloc( void *ptr, size_t len )
+static inline void __WINE_ALLOC_SIZE(2) *heap_realloc( void *ptr, size_t len )
 {
     return HeapReAlloc( me_heap, 0, ptr, len );
 }
diff --git a/include/objbase.h b/include/objbase.h
index 6a07a255859..9f606c01312 100644
--- a/include/objbase.h
+++ b/include/objbase.h
@@ -343,7 +343,7 @@ HRESULT WINAPI CoGetInstanceFromFile(COSERVERINFO* pServerInfo, CLSID* pClsid, I
 HRESULT WINAPI CoGetInstanceFromIStorage(COSERVERINFO* pServerInfo, CLSID* pClsid, IUnknown* punkOuter, DWORD dwClsCtx, IStorage* pstg, DWORD dwCount, MULTI_QI* pResults);
 
 HRESULT WINAPI CoGetMalloc(DWORD dwMemContext, LPMALLOC* lpMalloc);
-LPVOID WINAPI CoTaskMemAlloc(ULONG size);
+LPVOID WINAPI CoTaskMemAlloc(ULONG size) __WINE_ALLOC_SIZE(1);
 void WINAPI CoTaskMemFree(LPVOID ptr);
 LPVOID WINAPI CoTaskMemRealloc(LPVOID ptr, ULONG size);
 
diff --git a/include/rpcndr.h b/include/rpcndr.h
index 9bf28407951..7c0efafec20 100644
--- a/include/rpcndr.h
+++ b/include/rpcndr.h
@@ -652,7 +652,7 @@ RPCRTAPI LONG RPC_ENTRY
   NdrDcomAsyncStubCall( struct IRpcStubBuffer* pThis, struct IRpcChannelBuffer* pChannel, PRPC_MESSAGE pRpcMsg, DWORD * pdwStubPhase );
 
 RPCRTAPI void* RPC_ENTRY
-  NdrAllocate( PMIDL_STUB_MESSAGE pStubMsg, size_t Len );
+  NdrAllocate( PMIDL_STUB_MESSAGE pStubMsg, size_t Len ) __WINE_ALLOC_SIZE(2);
 
 RPCRTAPI void RPC_ENTRY
   NdrClearOutParameters( PMIDL_STUB_MESSAGE pStubMsg, PFORMAT_STRING pFormat, void *ArgAddr );
diff --git a/include/shlobj.h b/include/shlobj.h
index 3e6e7a5bf8b..284a0205d85 100644
--- a/include/shlobj.h
+++ b/include/shlobj.h
@@ -40,7 +40,7 @@ DECLARE_HANDLE(HPSXA);
 #endif
 
 UINT         WINAPI SHAddFromPropSheetExtArray(HPSXA,LPFNADDPROPSHEETPAGE,LPARAM);
-LPVOID       WINAPI SHAlloc(ULONG);
+LPVOID       WINAPI SHAlloc(ULONG) __WINE_ALLOC_SIZE(1);
 HRESULT      WINAPI SHCoCreateInstance(LPCWSTR,const CLSID*,IUnknown*,REFIID,LPVOID*);
 HPSXA        WINAPI SHCreatePropSheetExtArray(HKEY,LPCWSTR,UINT);
 HPSXA        WINAPI SHCreatePropSheetExtArrayEx(HKEY,LPCWSTR,UINT,IDataObject*);
diff --git a/include/winbase.h b/include/winbase.h
index 007d7b6a02b..0b637f56492 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -1744,7 +1744,7 @@ WINBASEAPI UINT        WINAPI GetWindowsDirectoryW(LPWSTR,UINT);
 WINBASEAPI ATOM        WINAPI GlobalAddAtomA(LPCSTR);
 WINBASEAPI ATOM        WINAPI GlobalAddAtomW(LPCWSTR);
 #define                       GlobalAddAtom WINELIB_NAME_AW(GlobalAddAtom)
-WINBASEAPI HGLOBAL     WINAPI GlobalAlloc(UINT,SIZE_T);
+WINBASEAPI HGLOBAL     WINAPI GlobalAlloc(UINT,SIZE_T) __WINE_ALLOC_SIZE(2);
 WINBASEAPI SIZE_T      WINAPI GlobalCompact(DWORD);
 WINBASEAPI ATOM        WINAPI GlobalDeleteAtom(ATOM);
 WINBASEAPI ATOM        WINAPI GlobalFindAtomA(LPCSTR);
@@ -1760,20 +1760,20 @@ WINBASEAPI HGLOBAL     WINAPI GlobalHandle(LPCVOID);
 WINBASEAPI LPVOID      WINAPI GlobalLock(HGLOBAL);
 WINBASEAPI VOID        WINAPI GlobalMemoryStatus(LPMEMORYSTATUS);
 WINBASEAPI BOOL        WINAPI GlobalMemoryStatusEx(LPMEMORYSTATUSEX);
-WINBASEAPI HGLOBAL     WINAPI GlobalReAlloc(HGLOBAL,SIZE_T,UINT);
+WINBASEAPI HGLOBAL     WINAPI GlobalReAlloc(HGLOBAL,SIZE_T,UINT) __WINE_ALLOC_SIZE(3);
 WINBASEAPI SIZE_T      WINAPI GlobalSize(HGLOBAL);
 WINBASEAPI VOID        WINAPI GlobalUnfix(HGLOBAL);
 WINBASEAPI BOOL        WINAPI GlobalUnlock(HGLOBAL);
 WINBASEAPI BOOL        WINAPI GlobalUnWire(HGLOBAL);
 WINBASEAPI LPVOID      WINAPI GlobalWire(HGLOBAL);
 #define                       HasOverlappedCompleted(lpOverlapped) ((lpOverlapped)->Internal != STATUS_PENDING)
-WINBASEAPI LPVOID      WINAPI HeapAlloc(HANDLE,DWORD,SIZE_T);
+WINBASEAPI LPVOID      WINAPI HeapAlloc(HANDLE,DWORD,SIZE_T) __WINE_ALLOC_SIZE(3);
 WINBASEAPI SIZE_T      WINAPI HeapCompact(HANDLE,DWORD);
 WINBASEAPI HANDLE      WINAPI HeapCreate(DWORD,SIZE_T,SIZE_T);
 WINBASEAPI BOOL        WINAPI HeapDestroy(HANDLE);
 WINBASEAPI BOOL        WINAPI HeapFree(HANDLE,DWORD,LPVOID);
 WINBASEAPI BOOL        WINAPI HeapLock(HANDLE);
-WINBASEAPI LPVOID      WINAPI HeapReAlloc(HANDLE,DWORD,LPVOID,SIZE_T);
+WINBASEAPI LPVOID      WINAPI HeapReAlloc(HANDLE,DWORD,LPVOID,SIZE_T) __WINE_ALLOC_SIZE(4);
 WINBASEAPI BOOL        WINAPI HeapQueryInformation(HANDLE,HEAP_INFORMATION_CLASS,PVOID,SIZE_T,PSIZE_T);
 WINBASEAPI BOOL        WINAPI HeapSetInformation(HANDLE,HEAP_INFORMATION_CLASS,PVOID,SIZE_T);
 WINBASEAPI SIZE_T      WINAPI HeapSize(HANDLE,DWORD,LPCVOID);
@@ -1822,13 +1822,13 @@ WINBASEAPI HMODULE     WINAPI LoadLibraryExW(LPCWSTR,HANDLE,DWORD);
 #define                       LoadLibraryEx WINELIB_NAME_AW(LoadLibraryEx)
 WINBASEAPI HINSTANCE   WINAPI LoadModule(LPCSTR,LPVOID);
 WINBASEAPI HGLOBAL     WINAPI LoadResource(HMODULE,HRSRC);
-WINBASEAPI HLOCAL      WINAPI LocalAlloc(UINT,SIZE_T);
+WINBASEAPI HLOCAL      WINAPI LocalAlloc(UINT,SIZE_T) __WINE_ALLOC_SIZE(2);
 WINBASEAPI SIZE_T      WINAPI LocalCompact(UINT);
 WINBASEAPI UINT        WINAPI LocalFlags(HLOCAL);
 WINBASEAPI HLOCAL      WINAPI LocalFree(HLOCAL);
 WINBASEAPI HLOCAL      WINAPI LocalHandle(LPCVOID);
 WINBASEAPI LPVOID      WINAPI LocalLock(HLOCAL);
-WINBASEAPI HLOCAL      WINAPI LocalReAlloc(HLOCAL,SIZE_T,UINT);
+WINBASEAPI HLOCAL      WINAPI LocalReAlloc(HLOCAL,SIZE_T,UINT) __WINE_ALLOC_SIZE(3);
 WINBASEAPI SIZE_T      WINAPI LocalShrink(HGLOBAL,UINT);
 WINBASEAPI SIZE_T      WINAPI LocalSize(HLOCAL);
 WINBASEAPI BOOL        WINAPI LocalUnlock(HLOCAL);
diff --git a/include/wincrypt.h b/include/wincrypt.h
index ba16cd5dab5..e6006ee7c5c 100644
--- a/include/wincrypt.h
+++ b/include/wincrypt.h
@@ -3806,8 +3806,8 @@ WINADVAPI BOOL WINAPI CryptVerifySignatureW (HCRYPTHASH, CONST BYTE *, DWORD, HC
 #define               CryptVerifySignature WINELIB_NAME_AW(CryptVerifySignature)
 
 /* crypt32.dll functions */
-LPVOID WINAPI CryptMemAlloc(ULONG cbSize);
-LPVOID WINAPI CryptMemRealloc(LPVOID pv, ULONG cbSize);
+LPVOID WINAPI CryptMemAlloc(ULONG cbSize) __WINE_ALLOC_SIZE(1);
+LPVOID WINAPI CryptMemRealloc(LPVOID pv, ULONG cbSize) __WINE_ALLOC_SIZE(2);
 VOID   WINAPI CryptMemFree(LPVOID pv);
 
 BOOL WINAPI CryptBinaryToStringA(const BYTE *pbBinary,
diff --git a/include/winnt.h b/include/winnt.h
index 87ab433788b..6fa89ddb884 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -162,6 +162,12 @@ extern "C" {
 # define DECLSPEC_HIDDEN
 #endif
 
+#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))
+#define __WINE_ALLOC_SIZE(x) __attribute__((__alloc_size__(x)))
+#else
+#define __WINE_ALLOC_SIZE(x)
+#endif
+
 /* Anonymous union/struct handling */
 
 #ifndef NONAMELESSSTRUCT
diff --git a/include/winternl.h b/include/winternl.h
index 17b6d885b02..04bc3e4e3d5 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -2094,7 +2094,7 @@ NTSYSAPI PVOID     WINAPI RtlAddVectoredExceptionHandler(ULONG,PVECTORED_EXCEPTI
 NTSYSAPI NTSTATUS  WINAPI RtlAdjustPrivilege(ULONG,BOOLEAN,BOOLEAN,PBOOLEAN);
 NTSYSAPI NTSTATUS  WINAPI RtlAllocateAndInitializeSid(PSID_IDENTIFIER_AUTHORITY,BYTE,DWORD,DWORD,DWORD,DWORD,DWORD,DWORD,DWORD,DWORD,PSID *);
 NTSYSAPI RTL_HANDLE * WINAPI RtlAllocateHandle(RTL_HANDLE_TABLE *,ULONG *);
-NTSYSAPI PVOID     WINAPI RtlAllocateHeap(HANDLE,ULONG,SIZE_T);
+NTSYSAPI PVOID     WINAPI RtlAllocateHeap(HANDLE,ULONG,SIZE_T) __WINE_ALLOC_SIZE(3);
 NTSYSAPI WCHAR     WINAPI RtlAnsiCharToUnicodeChar(LPSTR *);
 NTSYSAPI DWORD     WINAPI RtlAnsiStringToUnicodeSize(const STRING *);
 NTSYSAPI NTSTATUS  WINAPI RtlAnsiStringToUnicodeString(PUNICODE_STRING,PCANSI_STRING,BOOLEAN);