--- tee.c	2015-06-26 19:04:19.000000000 +0200
+++ tee-fix.c	2015-10-03 11:35:37.190245786 +0200
@@ -194,10 +194,12 @@
 
   descriptors = xnmalloc (nfiles + 1, sizeof *descriptors);
 
-  /* Move all the names 'up' one in the argv array to make room for
-     the entry for standard output.  This writes into argv[argc].  */
-  for (i = nfiles; i >= 1; i--)
-    files[i] = files[i - 1];
+  /* Effectively move all the names 'up' one in the argv array to
+     make room for the entry for standard output.  This will cause
+     the element of argv immediately before the list of file
+     (either an options argument or argv[0]) to be overwritten
+     later. */
+  files--;
 
   if (O_BINARY && ! isatty (STDIN_FILENO))
     xfreopen (NULL, "rb", stdin);