diff --git a/gtk2_ardour/dark.colors b/gtk2_ardour/dark.colors
index 89d9169997..3f7e5ce42e 100644
--- a/gtk2_ardour/dark.colors
+++ b/gtk2_ardour/dark.colors
@@ -56,7 +56,7 @@
     <Color name="color 42" value="0x404145ff"/>
     <Color name="color 43" value="0x000424ff"/>
     <Color name="color 44" value="0x004f08ff"/>
-    <Color name="color 45" value="0xa29e9e76"/>
+    <Color name="color 45" value="0xa29e9eff"/>
     <Color name="color 46" value="0x333333ff"/>
     <Color name="color 47" value="0x00880eff"/>
     <Color name="color 48" value="0x00aa11ff"/>
@@ -494,7 +494,8 @@
     <Modifier name="midi sysex fill" modifier="= alpha:0.4666"/>
     <Modifier name="verbose canvas cursor" modifier="= alpha:0.4666"/>
 
-    <Modifier name="modifier 45" modifier="= alpha:0.4627"/>
+    <Modifier name="measure line beat" modifier="= alpha:0.4627"/>
+    <Modifier name="piano roll white" modifier="= alpha:0.4627"/>
     <Modifier name="modifier 5" modifier="= alpha:0.4078"/>
     <Modifier name="modifier 51" modifier="= alpha:0.4"/>
     <Modifier name="modifier 60" modifier="= alpha:0.6274"/>
diff --git a/gtk2_ardour/midi_streamview.cc b/gtk2_ardour/midi_streamview.cc
index ee9e4ff5d3..6af17ced4e 100644
--- a/gtk2_ardour/midi_streamview.cc
+++ b/gtk2_ardour/midi_streamview.cc
@@ -336,7 +336,7 @@ MidiStreamView::draw_note_lines()
 			color = ARDOUR_UI::config()->color ("piano roll black");
 			break;
 		default:
-			color = ARDOUR_UI::config()->color ("piano roll white");
+			color = ARDOUR_UI::config()->color_mod ("piano roll white", "piano roll white");
 			break;
 		}
 
diff --git a/gtk2_ardour/tempo_lines.cc b/gtk2_ardour/tempo_lines.cc
index 7f83065c2e..22efb6c370 100644
--- a/gtk2_ardour/tempo_lines.cc
+++ b/gtk2_ardour/tempo_lines.cc
@@ -88,7 +88,7 @@ TempoLines::draw (const ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
 			if (beat_density > 0.3) {
 				continue; /* only draw beat lines if the gaps between beats are large. */
 			}
-			color = ARDOUR_UI::config()->color ("measure line beat");
+			color = ARDOUR_UI::config()->color_mod ("measure line beat", "measure line beat");
 		}
 
 		ArdourCanvas::Coord xpos = PublicEditor::instance().sample_to_pixel_unrounded ((*i).frame);