mse/mse_test.go | 1 +

diff --git a/mse/mse_test.go b/mse/mse_test.go
index 3efaf98d7f59be189f81a9e34c65ad4a651a22ad..5eeb73af65836a7e3ce7c8d263e38ca3f72ed9fc 100644
--- a/mse/mse_test.go
+++ b/mse/mse_test.go
@@ -190,6 +190,7 @@ 			rw, _, err := ReceiveHandshake(bc, sliceIter([][]byte{[]byte("cats")}), func(CryptoMethod) CryptoMethod { return crypto })
 			require.NoError(t, err)
 			require.NoError(t, readAndWrite(rw, br, b))
 		}()
+		wg.Wait()
 		t.StopTimer()
 		if !bytes.Equal(ar, b) {
 			t.Fatalf("A read the wrong bytes")