diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
index c98b92d30..3a6823325 100644
--- a/winsup/cygwin/exceptions.cc
+++ b/winsup/cygwin/exceptions.cc
@@ -902,7 +902,9 @@ sig_handle_tty_stop (int sig, siginfo_t *, void *)
 	 thread. */
       /* Use special cygwait parameter to handle SIGCONT.  _main_tls.sig will
 	 be cleared under lock when SIGCONT is detected.  */
+      pthread::suspend_all_except_self ();
       DWORD res = cygwait (NULL, cw_infinite, cw_sig_cont);
+      pthread::resume_all ();
       switch (res)
 	{
 	case WAIT_SIGNALED: