diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index 2346c8ce05c..df9527d31de 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -348,6 +348,33 @@ int _wchmod(const MSVCRT_wchar_t *path, int flags)
   return -1;
 }
 
+/*********************************************************************
+ *		_chsize (MSVCRT.@)
+ */
+int _chsize(int fd, long size)
+{
+    FIXME("(fd=%d, size=%ld): stub\n", fd, size);
+    return -1;
+}
+
+/*********************************************************************
+ *		_dup (MSVCRT.@)
+ */
+int _dup(int od)
+{
+    FIXME("(od=%d): stub\n", od);
+    return -1;
+}
+
+/*********************************************************************
+ *		_dup2 (MSVCRT.@)
+ */
+int _dup2(int od, int nd)
+{
+    FIXME("(od=%d, nd=%d): stub\n", od, nd);
+    return -1;
+}
+
 /*********************************************************************
  *		_unlink (MSVCRT.@)
  */
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 936f9e4e0ce..47197d0dc3f 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -179,7 +179,7 @@
 @ cdecl _chgsign( double ) _chgsign
 @ cdecl -i386 _chkesp() _chkesp
 @ cdecl _chmod(str long) _chmod
-@ stub _chsize #(long long)
+@ cdecl _chsize (long long) _chsize
 @ cdecl _clearfp() _clearfp
 @ cdecl _close(long) _close
 @ cdecl _commit(long) _commit
@@ -195,8 +195,8 @@
 @ cdecl _cwait(ptr long long) _cwait
 @ stub _daylight
 @ stub _dstbias
-@ stub _dup #(long)
-@ stub _dup2 #(long long)
+@ cdecl _dup (long) _dup
+@ cdecl _dup2 (long long) _dup2
 @ cdecl _ecvt( double long ptr ptr) ecvt
 @ cdecl _endthread () _endthread
 @ cdecl _endthreadex(long) _endthreadex