diff --git a/remote_control/opencv_viewer_example.py b/remote_control/opencv_viewer_example.py
index 823c139..510e379 100644
--- a/remote_control/opencv_viewer_example.py
+++ b/remote_control/opencv_viewer_example.py
@@ -244,7 +244,7 @@ class ArucoEstimator:
             if orientation == '>':
                 angle = y_frac * angle_ab + (1 - y_frac) * angle_dc
             elif orientation == '<':
-                angle = - (y_frac * angle_ab + (1 - y_frac) * angle_dc)
+                angle = y_frac * angle_ab + (1 - y_frac) * angle_dc + np.pi
             elif orientation == 'v':
                 angle = x_frac * angle_ad + (1 - x_frac) * angle_bc
             elif orientation == '^':