diff --git a/gtk2_ardour/themes/adwaita_dark-ardour.colors b/gtk2_ardour/themes/adwaita_dark-ardour.colors
index 6b80fd9deb..3e55588af7 100644
--- a/gtk2_ardour/themes/adwaita_dark-ardour.colors
+++ b/gtk2_ardour/themes/adwaita_dark-ardour.colors
@@ -456,6 +456,9 @@
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
     <ColorAlias name="tempo marker" alias="widget:orange"/>
     <ColorAlias name="tempo marker music" alias="widget:orange"/>
diff --git a/gtk2_ardour/themes/blueberry_milk-ardour.colors b/gtk2_ardour/themes/blueberry_milk-ardour.colors
index ae705deedf..6719ffc372 100644
--- a/gtk2_ardour/themes/blueberry_milk-ardour.colors
+++ b/gtk2_ardour/themes/blueberry_milk-ardour.colors
@@ -447,6 +447,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="alert:red"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="region mark" alias="theme:contrasting alt"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
diff --git a/gtk2_ardour/themes/caineville-ardour.colors b/gtk2_ardour/themes/caineville-ardour.colors
index 98a1de977a..37e1e56b8b 100644
--- a/gtk2_ardour/themes/caineville-ardour.colors
+++ b/gtk2_ardour/themes/caineville-ardour.colors
@@ -448,6 +448,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="region mark" alias="neutral:backgroundest"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
diff --git a/gtk2_ardour/themes/captain_light-ardour.colors b/gtk2_ardour/themes/captain_light-ardour.colors
index 43e526dfe0..cd672f04ec 100644
--- a/gtk2_ardour/themes/captain_light-ardour.colors
+++ b/gtk2_ardour/themes/captain_light-ardour.colors
@@ -452,6 +452,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="alert:red"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
     <ColorAlias name="tempo marker" alias="widget:orange"/>
diff --git a/gtk2_ardour/themes/clear_gray-ardour.colors b/gtk2_ardour/themes/clear_gray-ardour.colors
index f681b171ed..a25dd4ff2b 100644
--- a/gtk2_ardour/themes/clear_gray-ardour.colors
+++ b/gtk2_ardour/themes/clear_gray-ardour.colors
@@ -448,6 +448,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="alert:red"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="region mark" alias="theme:contrasting alt"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
diff --git a/gtk2_ardour/themes/cubasish-ardour.colors b/gtk2_ardour/themes/cubasish-ardour.colors
index 94f8d1331e..cf7c3dfe55 100644
--- a/gtk2_ardour/themes/cubasish-ardour.colors
+++ b/gtk2_ardour/themes/cubasish-ardour.colors
@@ -448,6 +448,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="region mark" alias="theme:contrasting alt"/>
     <ColorAlias name="tempo bar" alias="neutral:backgroundest"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
diff --git a/gtk2_ardour/themes/dark-ardour.colors b/gtk2_ardour/themes/dark-ardour.colors
index b5a163c156..2d08ae663a 100644
--- a/gtk2_ardour/themes/dark-ardour.colors
+++ b/gtk2_ardour/themes/dark-ardour.colors
@@ -452,6 +452,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
     <ColorAlias name="tempo marker" alias="widget:orange"/>
diff --git a/gtk2_ardour/themes/diehard3-ardour.colors b/gtk2_ardour/themes/diehard3-ardour.colors
index a893b3fb82..7254ecf980 100644
--- a/gtk2_ardour/themes/diehard3-ardour.colors
+++ b/gtk2_ardour/themes/diehard3-ardour.colors
@@ -450,6 +450,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
     <ColorAlias name="tempo marker" alias="widget:orange"/>
diff --git a/gtk2_ardour/themes/recbox-ardour.colors b/gtk2_ardour/themes/recbox-ardour.colors
index 23b3b284a2..9abbd6dd5c 100644
--- a/gtk2_ardour/themes/recbox-ardour.colors
+++ b/gtk2_ardour/themes/recbox-ardour.colors
@@ -449,6 +449,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="region mark" alias="theme:contrasting alt"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
diff --git a/gtk2_ardour/themes/unastudia-ardour.colors b/gtk2_ardour/themes/unastudia-ardour.colors
index 77318fdb31..93b0ab2924 100644
--- a/gtk2_ardour/themes/unastudia-ardour.colors
+++ b/gtk2_ardour/themes/unastudia-ardour.colors
@@ -447,6 +447,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="region mark" alias="theme:contrasting alt"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>
diff --git a/gtk2_ardour/themes/xcolors-ardour.colors b/gtk2_ardour/themes/xcolors-ardour.colors
index 28c36f7897..cef6bd78ac 100644
--- a/gtk2_ardour/themes/xcolors-ardour.colors
+++ b/gtk2_ardour/themes/xcolors-ardour.colors
@@ -448,6 +448,9 @@
     <ColorAlias name="stretch clock: edited text" alias="theme:contrasting alt"/>
     <ColorAlias name="stretch clock: text" alias="theme:contrasting clock"/>
     <ColorAlias name="sync mark" alias="theme:contrasting clock"/>
+    <ColorAlias name="tab button: fill" alias="widget:bg"/>
+    <ColorAlias name="tab button: fill active" alias="neutral:midground"/>
+    <ColorAlias name="tab button: led active" alias="alert:red"/>
     <ColorAlias name="region mark" alias="theme:contrasting alt"/>
     <ColorAlias name="tempo bar" alias="neutral:background2"/>
     <ColorAlias name="tempo curve" alias="widget:blue"/>