diff --git a/utils/tuning/libtuning/modules/lsc/lsc.py b/utils/tuning/libtuning/modules/lsc/lsc.py
index 344a07a3d443..b6a24cf42874 100644
--- a/utils/tuning/libtuning/modules/lsc/lsc.py
+++ b/utils/tuning/libtuning/modules/lsc/lsc.py
@@ -59,7 +59,8 @@ class LSC(Module):
     def _lsc_single_channel(self, channel: np.array,
                             image: lt.Image, green_grid: np.array = None):
         grid = self._get_grid(channel, image.w, image.h)
-        grid -= image.blacklevel_16
+        grid = np.maximum(grid - image.blacklevel_16, 0.1)
+
         if green_grid is None:
             table = np.reshape(1 / grid, self.sector_shape[::-1])
         else: