diff --git a/src/stitching_scanner.py b/src/stitching_scanner.py
index 23376d3..feebda0 100644
--- a/src/stitching_scanner.py
+++ b/src/stitching_scanner.py
@@ -449,6 +449,7 @@ class StitchingScanner:
         no_movement_count = 0
         max_no_movement = 50
         stop_reason = 'stopped'
+        total_x = 0
         
         while self.running and not self.paused:
             if time.time() - start_time > self.config.max_scan_time:
@@ -460,7 +461,11 @@ class StitchingScanner:
                 self.log(f"Max dimension reached ({current_dim()}px)")
                 stop_reason = 'max_dim'
                 break
-            
+
+            if abs(total_x) >= max_mosaic_width:
+                self.log(f"Max dimension reached ({max_mosaic_width}px)")
+                stop_reason = 'max_dim'
+                break
             # Pulse motor
             self.motion.send_command(start_cmd)
             time.sleep(self.config.movement_interval)
@@ -473,6 +478,7 @@ class StitchingScanner:
             
             self._displacement_since_append_x += dx
             self._displacement_since_append_y += dy
+            total_x += dx
             
             with self._state_lock:
                 self.state.cumulative_x = self._displacement_since_append_x