diff --git a/dlls/dmscript/script.c b/dlls/dmscript/script.c
index d7c696b..3837d10 100644
--- a/dlls/dmscript/script.c
+++ b/dlls/dmscript/script.c
@@ -497,7 +497,7 @@ static HRESULT WINAPI IDirectMusicScriptImpl_IPersistStream_Load (LPPERSISTSTREA
 								    WideCharToMultiByte(CP_ACP, 0, This->pwzSource, -1, str, count, NULL, NULL);
 								    str[count-1] = '\n';
 								    TRACE("source:\n");
-								    write( 2, str, count );
+								    write( STDERR_FILENO, str, count );
 								    HeapFree(GetProcessHeap(), 0, str);
 								}
 								break;
diff --git a/dlls/kernel32/console.c b/dlls/kernel32/console.c
index 34994af..3a75a1d 100644
--- a/dlls/kernel32/console.c
+++ b/dlls/kernel32/console.c
@@ -261,7 +261,7 @@ BOOL WINAPI Beep( DWORD dwFreq, DWORD dwDur )
 {
     static const char beep = '\a';
     /* dwFreq and dwDur are ignored by Win95 */
-    if (isatty(2)) write( 2, &beep, 1 );
+    if (isatty(STDERR_FILENO)) write( STDERR_FILENO, &beep, 1 );
     return TRUE;
 }
 
diff --git a/dlls/msvcrt/errno.c b/dlls/msvcrt/errno.c
index 6ed6086..e98d894 100644
--- a/dlls/msvcrt/errno.c
+++ b/dlls/msvcrt/errno.c
@@ -241,11 +241,11 @@ void CDECL MSVCRT_perror(const char* str)
 
     if (str && *str)
     {
-        MSVCRT__write( 2, str, strlen(str) );
-        MSVCRT__write( 2, ": ", 2 );
+        MSVCRT__write( MSVCRT_STDERR_FILENO, str, strlen(str) );
+        MSVCRT__write( MSVCRT_STDERR_FILENO, ": ", 2 );
     }
-    MSVCRT__write( 2, MSVCRT__sys_errlist[err], strlen(MSVCRT__sys_errlist[err]) );
-    MSVCRT__write( 2, "\n", 1 );
+    MSVCRT__write( MSVCRT_STDERR_FILENO, MSVCRT__sys_errlist[err], strlen(MSVCRT__sys_errlist[err]) );
+    MSVCRT__write( MSVCRT_STDERR_FILENO, "\n", 1 );
 }
 
 /******************************************************************************
diff --git a/dlls/ntdll/debugtools.c b/dlls/ntdll/debugtools.c
index cb08285..1f0994e 100644
--- a/dlls/ntdll/debugtools.c
+++ b/dlls/ntdll/debugtools.c
@@ -143,7 +143,7 @@ static int NTDLL_dbg_vprintf( const char *format, va_list args )
     else
     {
         char *pos = info->output;
-        write( 2, pos, info->out_pos + end - pos );
+        write( STDERR_FILENO, pos, info->out_pos + end - pos );
         /* move beginning of next line to start of buffer */
         memmove( pos, info->out_pos + end, ret - end );
         info->out_pos = pos + ret - end;
diff --git a/libs/wine/debug.c b/libs/wine/debug.c
index 12dbeb8..363e1e9 100644
--- a/libs/wine/debug.c
+++ b/libs/wine/debug.c
@@ -26,6 +26,9 @@
 #include <stdarg.h>
 #include <string.h>
 #include <ctype.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
 
 #include "wine/debug.h"
 #include "wine/library.h"
@@ -177,7 +180,7 @@ static void debug_usage(void)
         "Example: WINEDEBUG=+all,warn-heap\n"
         "    turns on all messages except warning heap messages\n"
         "Available message classes: err, warn, fixme, trace\n";
-    write( 2, usage, sizeof(usage) - 1 );
+    write( STDERR_FILENO, usage, sizeof(usage) - 1 );
     exit(1);
 }
 
diff --git a/loader/preloader.c b/loader/preloader.c
index 1143972..1b9b1b2 100644
--- a/loader/preloader.c
+++ b/loader/preloader.c
@@ -419,7 +419,7 @@ static __attribute__((format(printf,1,2))) void wld_printf(const char *fmt, ...
     va_start( args, fmt );
     len = wld_vsprintf(buffer, fmt, args );
     va_end( args );
-    wld_write(2, buffer, len);
+    wld_write(STDERR_FILENO, buffer, len);
 }
 
 static __attribute__((noreturn,format(printf,1,2))) void fatal_error(const char *fmt, ... )
@@ -431,7 +431,7 @@ static __attribute__((noreturn,format(printf,1,2))) void fatal_error(const char
     va_start( args, fmt );
     len = wld_vsprintf(buffer, fmt, args );
     va_end( args );
-    wld_write(2, buffer, len);
+    wld_write(STDERR_FILENO, buffer, len);
     wld_exit(1);
 }