diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index df493158..a12e1d85 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -73,7 +73,6 @@ var waterfall_min_level_default;
 var waterfall_max_level_default;
 var waterfall_colors = buildWaterfallColors(['#000', '#FFF']);
 var waterfall_auto_levels;
-var waterfall_auto_level_default_mode;
 var waterfall_auto_min_range;
 var waterfall_measure_minmax_now = false;
 var waterfall_measure_minmax_continuous = false;
@@ -737,7 +736,7 @@ function on_ws_recv(evt) {
                         if ('waterfall_auto_min_range' in config)
                             waterfall_auto_min_range = config['waterfall_auto_min_range'];
                         if ('waterfall_auto_level_default_mode' in config)
-                            waterfall_measure_minmax_continuous = waterfall_auto_level_default_mode = config['waterfall_auto_level_default_mode'];
+                            waterfall_measure_minmax_continuous = config['waterfall_auto_level_default_mode'];
                             var waterfallAutoButton = $('#openwebrx-waterfall-colors-auto');
                             waterfallAutoButton[waterfall_measure_minmax_continuous ? 'addClass' : 'removeClass']('highlighted');
                             $('#openwebrx-waterfall-color-min, #openwebrx-waterfall-color-max').prop('disabled', waterfall_measure_minmax_continuous);