diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 5d3052234..708d34b2e 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+Tue May 22 12:20:07 2001  Christopher Faylor <cgf@cygnus.com>
+
+	* signal.cc (sleep): Protect with sigframe.
+
 Tue May 22 17:58:00 2001  Corinna Vinschen <corinna@vinschen.de>
 
 	* security.cc (get_file_attribute): Don't set errno.
diff --git a/winsup/cygwin/signal.cc b/winsup/cygwin/signal.cc
index bc3746b2d..8b10f416d 100644
--- a/winsup/cygwin/signal.cc
+++ b/winsup/cygwin/signal.cc
@@ -68,6 +68,7 @@ sleep (unsigned int seconds)
   int rc;
   unsigned start_time;
   unsigned int res;
+  sigframe thisframe (mainthread);
 
   start_time = GetTickCount ();