diff --git a/app/gl_tracking.c b/app/gl_tracking.c
index 6564754..3664bab 100644
--- a/app/gl_tracking.c
+++ b/app/gl_tracking.c
@@ -213,10 +213,10 @@ void MidLineTrack()
             if (dy > 0) {
                 pure_angle      = -atanf(dx / dy) / PI32 * 180.0f;
                 last_pure_angle = pure_angle;
-                last_pure_angle_half = pure_angle_half;
+                //last_pure_angle_half = pure_angle_half;
             } else {
                 pure_angle = last_pure_angle;
-                pure_angle_half = last_pure_angle_half;
+                //pure_angle_half = last_pure_angle_half;
             }
         }