diff -up expect5.45/exp_clib.c.orig expect5.45/exp_clib.c
--- expect5.45/exp_command.c.orig	2014-09-04 12:12:21.075837835 +0200
+++ expect5.45/exp_command.c	2014-09-04 12:13:39.098593465 +0200
@@ -1161,7 +1161,7 @@ Exp_SpawnObjCmd(
     /* if stty finds dev(stderr) != dev(stdout) */
 
     /* save error fd while we're setting up new one */
-    errorfd = fcntl(2,F_DUPFD,3);
+    errorfd = fcntl(2,F_DUPFD_CLOEXEC,3);
     /* and here is the macro to restore it */
 #define restore_error_fd {close(2);fcntl(errorfd,F_DUPFD,2);}