1 files changed, 3 insertions, 0 deletions

diff --git a/src/m/alpha.h b/src/m/alpha.h
index ef070198e80..d113f8f32eb 100644
--- a/src/m/alpha.h
+++ b/src/m/alpha.h
@@ -266,8 +266,11 @@ extern void r_alloc_free ();
   do                                                    \
     {                                                   \
       int dummy;                                        \
+      SIGMASKTYPE mask;                                 \
+      mask = sigblockx (SIGCHLD);                       \
       if (-1 == openpty (&fd, &dummy, pty_name, 0, 0))  \
         fd = -1;                                        \
+      sigsetmask (mask);                                \
       close (dummy);                                    \
     }                                                   \
   while (0)