diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index c02dfb8ed..484bf55dc 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -2056,7 +2056,7 @@ fhandler_pty_common::resize_pseudo_console (struct winsize *ws)
     OpenProcess (PROCESS_DUP_HANDLE, FALSE, get_ttyp ()->nat_pipe_owner_pid);
   DuplicateHandle (pcon_owner, get_ttyp ()->h_pcon_write_pipe,
 		   GetCurrentProcess (), &hpcon_local.hWritePipe,
-		   0, TRUE, DUPLICATE_SAME_ACCESS);
+		   0, FALSE, DUPLICATE_SAME_ACCESS);
   acquire_attach_mutex (mutex_timeout);
   ResizePseudoConsole ((HPCON) &hpcon_local, size);
   release_attach_mutex ();
@@ -3551,15 +3551,15 @@ fhandler_pty_slave::close_pseudoconsole (tty *ttyp, DWORD force_switch_to)
 	  DuplicateHandle (GetCurrentProcess (),
 			   ttyp->h_pcon_write_pipe,
 			   new_owner, &new_write_pipe,
-			   0, TRUE, DUPLICATE_SAME_ACCESS);
+			   0, FALSE, DUPLICATE_SAME_ACCESS);
 	  DuplicateHandle (GetCurrentProcess (),
 			   ttyp->h_pcon_condrv_reference,
 			   new_owner, &new_condrv_reference,
-			   0, TRUE, DUPLICATE_SAME_ACCESS);
+			   0, FALSE, DUPLICATE_SAME_ACCESS);
 	  DuplicateHandle (GetCurrentProcess (),
 			   ttyp->h_pcon_conhost_process,
 			   new_owner, &new_conhost_process,
-			   0, TRUE, DUPLICATE_SAME_ACCESS);
+			   0, FALSE, DUPLICATE_SAME_ACCESS);
 	  DuplicateHandle (GetCurrentProcess (), ttyp->h_pcon_in,
 			   new_owner, &new_pcon_in,
 			   0, TRUE, DUPLICATE_SAME_ACCESS);