diff --git a/gtk2_ardour/themes/blueberry_milk-ardour.colors b/gtk2_ardour/themes/blueberry_milk-ardour.colors
index 8a6199dea0..8b9e64c1b7 100644
--- a/gtk2_ardour/themes/blueberry_milk-ardour.colors
+++ b/gtk2_ardour/themes/blueberry_milk-ardour.colors
@@ -91,6 +91,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:backgroundest"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/caineville-ardour.colors b/gtk2_ardour/themes/caineville-ardour.colors
index f55bed1757..bc49928d71 100644
--- a/gtk2_ardour/themes/caineville-ardour.colors
+++ b/gtk2_ardour/themes/caineville-ardour.colors
@@ -92,6 +92,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:backgroundest"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/clear_gray-ardour.colors b/gtk2_ardour/themes/clear_gray-ardour.colors
index 55d692225b..12896dc987 100644
--- a/gtk2_ardour/themes/clear_gray-ardour.colors
+++ b/gtk2_ardour/themes/clear_gray-ardour.colors
@@ -92,6 +92,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:backgroundest"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/cubasish-ardour.colors b/gtk2_ardour/themes/cubasish-ardour.colors
index 1f3d5bf4cc..e6c5fe85f5 100644
--- a/gtk2_ardour/themes/cubasish-ardour.colors
+++ b/gtk2_ardour/themes/cubasish-ardour.colors
@@ -92,6 +92,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:backgroundest"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/dark-ardour.colors b/gtk2_ardour/themes/dark-ardour.colors
index 9c6e26fe1f..61ec97d5fb 100644
--- a/gtk2_ardour/themes/dark-ardour.colors
+++ b/gtk2_ardour/themes/dark-ardour.colors
@@ -94,6 +94,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:backgroundest"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/diehard3-ardour.colors b/gtk2_ardour/themes/diehard3-ardour.colors
index 9289285964..2a26b522e3 100644
--- a/gtk2_ardour/themes/diehard3-ardour.colors
+++ b/gtk2_ardour/themes/diehard3-ardour.colors
@@ -93,6 +93,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:backgroundest"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/recbox-ardour.colors b/gtk2_ardour/themes/recbox-ardour.colors
index 2f28c155b9..9cd0945f49 100644
--- a/gtk2_ardour/themes/recbox-ardour.colors
+++ b/gtk2_ardour/themes/recbox-ardour.colors
@@ -93,6 +93,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:background"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/unastudia-ardour.colors b/gtk2_ardour/themes/unastudia-ardour.colors
index 48b47b947c..bb72e6b2fd 100644
--- a/gtk2_ardour/themes/unastudia-ardour.colors
+++ b/gtk2_ardour/themes/unastudia-ardour.colors
@@ -91,6 +91,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="neutral:background"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/xcolors-ardour.colors b/gtk2_ardour/themes/xcolors-ardour.colors
index b7a75eee09..20494db25b 100644
--- a/gtk2_ardour/themes/xcolors-ardour.colors
+++ b/gtk2_ardour/themes/xcolors-ardour.colors
@@ -92,6 +92,7 @@
     <ColorAlias name="entered automation line" alias="widget:orange"/>
     <ColorAlias name="entered gain line" alias="widget:orange"/>
     <ColorAlias name="entered marker" alias="widget:orange"/>
+    <ColorAlias name="fader outline" alias="theme:bg2"/>
     <ColorAlias name="feedback alert: alt active" alias="alert:ruddy"/>
     <ColorAlias name="feedback alert: fill" alias="widget:bg"/>
     <ColorAlias name="feedback alert: fill active" alias="alert:red"/>
diff --git a/libs/widgets/ardour_fader.cc b/libs/widgets/ardour_fader.cc
index 32470dda05..7f1ff6e4c4 100644
--- a/libs/widgets/ardour_fader.cc
+++ b/libs/widgets/ardour_fader.cc
@@ -84,7 +84,7 @@ ArdourFader::ArdourFader (Gtk::Adjustment& adj, int orientation, int fader_lengt
 		CairoWidget::set_size_request(_span, _girth);
 	}
 
-	outline_color = UIConfigurationBase::instance().color ("generic button: outline");
+	outline_color = UIConfigurationBase::instance().color ("fader outline");
 
 }