diff -r d26a40d21d7a src/exec.c
--- a/src/exec.c	Tue May 27 10:16:49 2014 -0600
+++ b/src/exec.c	Tue May 27 10:44:25 2014 -0600
@@ -911,8 +911,13 @@
 {
     unsigned char signo = (unsigned char)s;
 
-    /* Only forward user-generated signals. */
-    if (info != NULL && info->si_code == SI_USER) {
+    /*
+     * Only forward user-generated signals not sent by the command.
+     * Signals sent by the kernel may include SIGTSTP when the user
+     * presses ^Z.  Curses programs often trap ^Z and send SIGTSTP
+     * to their pgrp, so we don't want to send an extra SIGTSTP.
+     */
+    if (info != NULL && info->si_code == SI_USER && info->si_pid != cmnd_pid) {
 	/*
 	 * The pipe is non-blocking, if we overflow the kernel's pipe
 	 * buffer we drop the signal.  This is not a problem in practice.