diff --git a/gtk2_ardour/ardour2_ui_default.conf b/gtk2_ardour/ardour2_ui_default.conf
index d6ee9d0304..f5988442f7 100644
--- a/gtk2_ardour/ardour2_ui_default.conf
+++ b/gtk2_ardour/ardour2_ui_default.conf
@@ -69,7 +69,7 @@
     <Option name="ImageTrack" value="ddddd8ff"/>
     <Option name="MarkerTrack" value="ddddd8ff"/>
     <Option name="ZeroLine" value="b5b5b5ff"/>
-    <Option name="GainLine" value="ff00ff00"/>
+    <Option name="GainLine" value="ff00ffff"/>
     <Option name="GainLineInactive" value="f0f0ffff"/>
     <Option name="RecordingRect" value="e5c6c6ff"/>
     <Option name="SelectionRect" value="e8f4d377"/>