diff --git a/terminatorlib/prefseditor.py b/terminatorlib/prefseditor.py
index 3f9edd2c..9a829d7a 100755
--- a/terminatorlib/prefseditor.py
+++ b/terminatorlib/prefseditor.py
@@ -545,9 +545,11 @@ class PrefsEditor:
         self.config['scrollbar_position'] = value
         self.config.save()
 
-    def on_darken_background_scale_change_value(self, widget):
+    def on_darken_background_scale_change_value(self, widget, scroll, value):
         """Background darkness setting changed"""
-        self.config['background_darkness'] = widget.get_value()
+        # FIXME: 'value' is a float with way too much precision. Round it off
+        # to 1 significant digit, e.g. 0.9 not 0.89989888413241345
+        self.config['background_darkness'] = value
         self.config.save()
 
     def on_background_image_filechooser_file_set(self, widget):