diff --git a/dlls/shell32/shlfolder.c b/dlls/shell32/shlfolder.c
index 67d2e2900de..5cd74feb4f4 100644
--- a/dlls/shell32/shlfolder.c
+++ b/dlls/shell32/shlfolder.c
@@ -22,7 +22,7 @@
 static HRESULT WINAPI IShellFolder_QueryInterface(LPSHELLFOLDER,REFIID,LPVOID*);
 static ULONG WINAPI IShellFolder_AddRef(LPSHELLFOLDER);
 static ULONG WINAPI IShellFolder_Release(LPSHELLFOLDER);
-static HRESULT WINAPI IShellFolder_Initialize(LPSHELLFOLDER,LPCITEMIDLIST);
+static HRESULT WINAPI WINE_UNUSED IShellFolder_Initialize(LPSHELLFOLDER,LPCITEMIDLIST);
 static HRESULT WINAPI IShellFolder_ParseDisplayName(LPSHELLFOLDER,HWND,LPBC,LPOLESTR,DWORD*,LPITEMIDLIST*,DWORD*);
 static HRESULT WINAPI IShellFolder_EnumObjects(LPSHELLFOLDER,HWND,DWORD,LPENUMIDLIST*);
 static HRESULT WINAPI IShellFolder_BindToObject(LPSHELLFOLDER,LPCITEMIDLIST,LPBC,REFIID,LPVOID*);
@@ -465,7 +465,7 @@ static HRESULT WINAPI IShellFolder_EnumObjects(
  *  IShellFolder_Initialize()
  *  IPersistFolder Method
  */
-static HRESULT WINAPI IShellFolder_Initialize( LPSHELLFOLDER this,LPCITEMIDLIST pidl)
+static HRESULT WINAPI WINE_UNUSED IShellFolder_Initialize( LPSHELLFOLDER this,LPCITEMIDLIST pidl)
 {	TRACE(shell,"(%p)->(pidl=%p)\n",this,pidl);
 
 	if(this->pMyPidl)
diff --git a/if1632/thunk.c b/if1632/thunk.c
index ec782913fc9..3f695b405b2 100644
--- a/if1632/thunk.c
+++ b/if1632/thunk.c
@@ -153,7 +153,7 @@ static const CALLBACKS_TABLE CALLBACK_EmulatorTable =
     (void *)CallTo16_sreg_,                /* CallRegisterShortProc */
     (void *)CallTo16_lreg_,                /* CallRegisterLongProc */
     THUNK_CallTaskReschedule,              /* CallTaskRescheduleProc */
-    CallFrom16_p_long_wwwll,               /* CallFrom16WndProc */
+    (void*)CallFrom16_p_long_wwwll,        /* CallFrom16WndProc */
     THUNK_CallWndProc16,                   /* CallWndProc */
     (void *)CallTo16_long_lwwll,           /* CallDriverProc */
     (void *)CallTo16_word_wwlll,           /* CallDriverCallback */
diff --git a/scheduler/sysdeps.c b/scheduler/sysdeps.c
index 0337dd960fe..ac41e8a1c77 100644
--- a/scheduler/sysdeps.c
+++ b/scheduler/sysdeps.c
@@ -50,7 +50,7 @@ int *__errno_location()
     if (!thdb) return perrno;
 #ifdef NO_REENTRANT_X11
     /* Use static libc errno while running in Xlib. */
-    if (X11DRV_CritSection.OwningThread == thdb->server_tid)
+    if (X11DRV_CritSection.OwningThread == (HANDLE)thdb->server_tid)
         return perrno;
 #endif
     return &thdb->thread_errno;
@@ -67,7 +67,7 @@ int *__h_errno_location()
     if (!thdb) return ph_errno;
 #ifdef NO_REENTRANT_X11
     /* Use static libc h_errno while running in Xlib. */
-    if (X11DRV_CritSection.OwningThread == thdb->server_tid)
+    if (X11DRV_CritSection.OwningThread == (HANDLE)thdb->server_tid)
         return ph_errno;
 #endif
     return &thdb->thread_h_errno;
diff --git a/windows/queue.c b/windows/queue.c
index c2a4da22834..63e756df16f 100644
--- a/windows/queue.c
+++ b/windows/queue.c
@@ -1330,7 +1330,7 @@ DWORD WINAPI GetWindowThreadProcessId( HWND hwnd, LPDWORD process )
     tdb = (TDB*)GlobalLock16(htask);
     if (!tdb || !tdb->thdb) return 0;
     if (process) *process = (DWORD)tdb->thdb->process->server_pid;
-    return tdb->thdb->server_tid;
+    return (DWORD)tdb->thdb->server_tid;
 }