diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 2efb58676..bb4755071 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2001-10-31  Corinna Vinschen  <corinna@vinschen.de>
+
+	* dtable.cc (dtable::vfork_child_dup): Revert impersonation
+	before duplicating fhandler.
+
 2001-10-30  Christopher Faylor  <cgf@redhat.com>
 
 	* exceptions.cc (signal_exit): Weight the odds against the main thread
diff --git a/winsup/cygwin/dtable.cc b/winsup/cygwin/dtable.cc
index 4a14712a3..b929b169e 100644
--- a/winsup/cygwin/dtable.cc
+++ b/winsup/cygwin/dtable.cc
@@ -559,6 +559,10 @@ dtable::vfork_child_dup ()
   newtable = (fhandler_base **) ccalloc (HEAP_ARGV, size, sizeof (fds[0]));
   int res = 1;
 
+  /* Remove impersonation */
+  if (cygheap->user.impersonated && cygheap->user.token != INVALID_HANDLE_VALUE)
+    RevertToSelf ();
+
   for (size_t i = 0; i < size; i++)
     if (not_open (i))
       continue;
@@ -571,6 +575,10 @@ dtable::vfork_child_dup ()
 	goto out;
       }
 
+  /* Restore impersonation */
+  if (cygheap->user.impersonated && cygheap->user.token != INVALID_HANDLE_VALUE)
+    ImpersonateLoggedOnUser (cygheap->user.token);
+
   fds_on_hold = fds;
   fds = newtable;