diff --git a/selfdrive/ui/ui.h b/selfdrive/ui/ui.h
index fab68d3818..c341d06aa2 100644
--- a/selfdrive/ui/ui.h
+++ b/selfdrive/ui/ui.h
@@ -192,7 +192,7 @@ private:
   int awake_timeout = 0;
   float accel_prev = 0;
   float gyro_prev = 0;
-  float last_brightness = 0;
+  int last_brightness = 0;
   FirstOrderFilter brightness_filter;
 
   QTimer *timer;