diff --git a/scripts/led-matrix-viz.py b/scripts/led-matrix-viz.py
index 818df6c..2134d4e 100644
--- a/scripts/led-matrix-viz.py
+++ b/scripts/led-matrix-viz.py
@@ -94,6 +94,7 @@ def main():
     frames_sent = 0
     frames_dropped = 0
     router_errors = 0
+    stats_last_write = time.monotonic()
 
     while True:
         now = time.monotonic()
@@ -193,9 +194,9 @@ def main():
                 last_frame = frame
 
             # Write stats periodically (every 2s)
-            if now - _stats_last_write >= 2.0:
+            if now - stats_last_write >= 2.0:
                 _write_stats(frames_sent, frames_dropped, pending_frames)
-                _stats_last_write = now
+                stats_last_write = now
 
 
 _stats_last_write = 0.0