diff --git a/gtk2_ardour/themes/blueberry_milk-ardour.colors b/gtk2_ardour/themes/blueberry_milk-ardour.colors
index 80ecfe5d4e..8ffd6f6788 100644
--- a/gtk2_ardour/themes/blueberry_milk-ardour.colors
+++ b/gtk2_ardour/themes/blueberry_milk-ardour.colors
@@ -448,7 +448,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="alert:blue"/>
-    <ColorAlias name="transport marker bar" alias="widget:bg"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/caineville-ardour.colors b/gtk2_ardour/themes/caineville-ardour.colors
index aede3932f7..27c46d9f4e 100644
--- a/gtk2_ardour/themes/caineville-ardour.colors
+++ b/gtk2_ardour/themes/caineville-ardour.colors
@@ -449,7 +449,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="neutral:foreground"/>
-    <ColorAlias name="transport marker bar" alias="widget:bg"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:orange"/>
diff --git a/gtk2_ardour/themes/clear_gray-ardour.colors b/gtk2_ardour/themes/clear_gray-ardour.colors
index 34de203742..517af9b6cc 100644
--- a/gtk2_ardour/themes/clear_gray-ardour.colors
+++ b/gtk2_ardour/themes/clear_gray-ardour.colors
@@ -449,7 +449,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="theme:contrasting clock"/>
-    <ColorAlias name="transport marker bar" alias="widget:bg"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:red"/>
diff --git a/gtk2_ardour/themes/dark-ardour.colors b/gtk2_ardour/themes/dark-ardour.colors
index b7d694f589..256de3a827 100644
--- a/gtk2_ardour/themes/dark-ardour.colors
+++ b/gtk2_ardour/themes/dark-ardour.colors
@@ -450,7 +450,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="widget:blue"/>
-    <ColorAlias name="transport marker bar" alias="widget:bg"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/diehard3-ardour.colors b/gtk2_ardour/themes/diehard3-ardour.colors
index bee2d07ba4..c0ab9ce202 100644
--- a/gtk2_ardour/themes/diehard3-ardour.colors
+++ b/gtk2_ardour/themes/diehard3-ardour.colors
@@ -450,7 +450,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="alert:green"/>
-    <ColorAlias name="transport marker bar" alias="widget:bg"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/recbox-ardour.colors b/gtk2_ardour/themes/recbox-ardour.colors
index 8187562de7..5ae331ee8a 100644
--- a/gtk2_ardour/themes/recbox-ardour.colors
+++ b/gtk2_ardour/themes/recbox-ardour.colors
@@ -450,7 +450,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="alert:green"/>
-    <ColorAlias name="transport marker bar" alias="widget:bg"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/unastudia-ardour.colors b/gtk2_ardour/themes/unastudia-ardour.colors
index 5d32b1d5de..cf4286ab21 100644
--- a/gtk2_ardour/themes/unastudia-ardour.colors
+++ b/gtk2_ardour/themes/unastudia-ardour.colors
@@ -448,7 +448,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="alert:cyan"/>
-    <ColorAlias name="transport marker bar" alias="neutral:foregroundest"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:blue"/>
diff --git a/gtk2_ardour/themes/xcolors-ardour.colors b/gtk2_ardour/themes/xcolors-ardour.colors
index f864a593da..4605f89e31 100644
--- a/gtk2_ardour/themes/xcolors-ardour.colors
+++ b/gtk2_ardour/themes/xcolors-ardour.colors
@@ -449,7 +449,7 @@
     <ColorAlias name="transport delta clock: text" alias="theme:contrasting alt"/>
     <ColorAlias name="transport drag rect" alias="neutral:midground"/>
     <ColorAlias name="transport loop rect" alias="alert:green"/>
-    <ColorAlias name="transport marker bar" alias="widget:bg"/>
+    <ColorAlias name="transport marker bar" alias="neutral:background2"/>
     <ColorAlias name="transport option button: fill" alias="widget:bg"/>
     <ColorAlias name="transport option button: fill active" alias="widget:bg"/>
     <ColorAlias name="transport option button: led active" alias="alert:green"/>