diff --git a/src/programs/pkttyagent.c b/src/programs/pkttyagent.c
index 3c8d502..acbc3ab 100644
--- a/src/programs/pkttyagent.c
+++ b/src/programs/pkttyagent.c
@@ -262,8 +262,11 @@ main (int argc, char *argv[])
 	  tty_flags_saved = TRUE;
   }
 
+
   memset (&sa, 0, sizeof (sa));
   sa.sa_handler = &tty_handler;
+  sigemptyset(&sa.sa_mask);
+  sigaddset(&sa.sa_mask, SIGTTOU);
   sigaction (SIGTERM, &sa, &savesigterm);
   sigaction (SIGINT, &sa, &savesigint);
   sigaction (SIGTSTP, &sa, &savesigtstp);