diff --git a/src/stitching_scanner.py b/src/stitching_scanner.py
index 89d90c7..e3c0a27 100644
--- a/src/stitching_scanner.py
+++ b/src/stitching_scanner.py
@@ -489,7 +489,6 @@ class StitchingScanner:
             threshold_pixels = h * self.config.displacement_threshold
             max_dim = self.config.max_mosaic_height
             current_dim = lambda: self.state.mosaic_height
-            total_x = 0 if direction == ScanDirection.DOWN else self.config.max_mosaic_width
             start_cmd = 'S' if direction == ScanDirection.DOWN else 'N'
             stop_cmd = 's' if direction == ScanDirection.DOWN else 'n'