diff --git a/tests/utils/test_qtutils.py b/tests/utils/test_qtutils.py
index 9034e8e4e..ad4fb0c4a 100644
--- a/tests/utils/test_qtutils.py
+++ b/tests/utils/test_qtutils.py
@@ -774,7 +774,7 @@ class TestPyQIODevice:
         assert str(excinfo.value) == 'Random access not allowed!'
         proc.waitForFinished(1000)
         proc.kill()
-        assert dev.read().rstrip() == b'Hello World'
+        assert bytes(dev.read()).rstrip() == b'Hello World'
 
     def test_truncate(self, pyqiodev):
         with pytest.raises(io.UnsupportedOperation):