diff --git a/src/cmd/ksh93/tests/coprocess.sh b/src/cmd/ksh93/tests/coprocess.sh
index f8f2270ec..2a92a24f3 100755
--- a/src/cmd/ksh93/tests/coprocess.sh
+++ b/src/cmd/ksh93/tests/coprocess.sh
@@ -141,7 +141,7 @@ do
 	fi
 	wait $!
 	
-	( sleep .3 |& sleep .1 && kill $!; sleep .1; sleep .3 |& sleep .1 && kill $! ) ||
+	( sleep 3 |& sleep .1 && kill $!; sleep .5; sleep 3 |& sleep .1 && kill $! ) ||
 		err_exit "$cat coprocess cleanup not working correctly"
 	{ : |& } 2>/dev/null ||
 		err_exit "subshell $cat coprocess lingers in parent"