diff --git a/ChangeLog b/ChangeLog
index 2576e9bd555..cf6f92356f0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Aug  4 02:07:14 1999  Jeffrey A Law  (law@cygnus.com)
+
+	* config.sub (vxworks case): Use os=-vxworks, not os=vxworks.
+
 Tue Jun 22 23:45:18 1999  Tom Tromey  <tromey@cygnus.com>
 
 	* configure.in (target_libs): Added target-zlib.
diff --git a/config.sub b/config.sub
index 1f5eb5ef018..6efbe7b4634 100755
--- a/config.sub
+++ b/config.sub
@@ -105,7 +105,7 @@ case $os in
 	-scout)
 		;;
 	-wrs)
-		os=vxworks
+		os=-vxworks
 		basic_machine=$1
 		;;
 	-hiux*)