diff --git a/panon/backend/client.py b/panon/backend/client.py
index 238fdb2..fcb6955 100644
--- a/panon/backend/client.py
+++ b/panon/backend/client.py
@@ -80,7 +80,7 @@ async def mainloop():
             if not use_glDFT and spectrum_data is None:
                 # Set fps to 2 to lower CPU usage, when audio is unavailable.
                 latest_wave_data = spectrum_source.read(fps=2)
-                if smartmode:
+                if smart_mode:
                     spectrum_source.update_smart_device()
             else:
                 latest_wave_data = spectrum_source.read()