diff --git a/pytests/test_panel_brightness.py b/pytests/test_panel_brightness.py
index 892c7ee102877dc65c4f5917447e75787bc656da..48f0ef81aac2b304afd8eb44b5eed21d8e7df0fa 100644
--- a/pytests/test_panel_brightness.py
+++ b/pytests/test_panel_brightness.py
@@ -10,4 +10,4 @@ def test_panel_brightness():
     else:
         upper = 101
     f = open(os.path.join(path, 'brightness'))
-    assert int(f.read()) in range(0, upper)
+    assert int(f.read()) in range(0, upper + 1)