diff --git a/src/net/http/transport_test.go b/src/net/http/transport_test.go
index 3051ec9473..1221642f2f 100644
--- a/src/net/http/transport_test.go
+++ b/src/net/http/transport_test.go
@@ -1696,12 +1696,6 @@ func testCancelRequestWithChannelBeforeDo(t *testing.T, withCtx bool) {
 	defer ts.Close()
 	defer close(unblockc)
 
-	// Don't interfere with the next test on plan9.
-	// Cf. https://golang.org/issues/11476
-	if runtime.GOOS == "plan9" {
-		defer time.Sleep(500 * time.Millisecond)
-	}
-
 	tr := &Transport{}
 	defer tr.CloseIdleConnections()
 	c := &Client{Transport: tr}