diff --git a/rfg_adc_plotter/visualization/matplotlib_backend.py b/rfg_adc_plotter/visualization/matplotlib_backend.py
index 05b3da0..f3d56f8 100644
--- a/rfg_adc_plotter/visualization/matplotlib_backend.py
+++ b/rfg_adc_plotter/visualization/matplotlib_backend.py
@@ -436,7 +436,7 @@ def run_matplotlib(args):
         return base.T  # (bins, time)
 
     def update(_frame):
-        nonlocal frames_since_ylim_update
+        nonlocal frames_since_ylim_update, ref_out_saved
         changed = drain_queue() > 0
 
         # Обновление линии последнего свипа
@@ -592,7 +592,6 @@ def run_matplotlib(args):
 
         # Автоматическое сохранение медианы при накоплении 1000+ свипов
         if ref_out_file and not ref_out_saved and ring is not None:
-            nonlocal ref_out_saved
             filled_count = np.count_nonzero(~np.isnan(ring[:, 0]))
             if filled_count >= 1000:
                 try: