diff --git a/gtk2_ardour/themes/blueberry_milk-ardour.colors b/gtk2_ardour/themes/blueberry_milk-ardour.colors
index 2ea215ee3b..2de7e68002 100644
--- a/gtk2_ardour/themes/blueberry_milk-ardour.colors
+++ b/gtk2_ardour/themes/blueberry_milk-ardour.colors
@@ -383,6 +383,7 @@
     <ColorAlias name="send alert button: fill active" alias="alert:cyan"/>
     <ColorAlias name="send alert button: led active" alias="alert:red"/>
     <ColorAlias name="send bg" alias="neutral:backgroundest"/>
+    <ColorAlias name="send pan" alias="theme:contrasting alt"/>
     <ColorAlias name="shuttle" alias="widget:bg"/>
     <ColorAlias name="shuttle bg" alias="neutral:backgroundest"/>
     <ColorAlias name="shuttle text" alias="neutral:foregroundest"/>
diff --git a/gtk2_ardour/themes/caineville-ardour.colors b/gtk2_ardour/themes/caineville-ardour.colors
index bcd8341e6b..9cffdce5c2 100644
--- a/gtk2_ardour/themes/caineville-ardour.colors
+++ b/gtk2_ardour/themes/caineville-ardour.colors
@@ -384,6 +384,7 @@
     <ColorAlias name="send alert button: fill active" alias="alert:cyan"/>
     <ColorAlias name="send alert button: led active" alias="alert:red"/>
     <ColorAlias name="send bg" alias="neutral:backgroundest"/>
+    <ColorAlias name="send pan" alias="theme:contrasting alt"/>
     <ColorAlias name="shuttle" alias="widget:bg"/>
     <ColorAlias name="shuttle bg" alias="neutral:backgroundest"/>
     <ColorAlias name="shuttle text" alias="neutral:foregroundest"/>
diff --git a/gtk2_ardour/themes/clear_gray-ardour.colors b/gtk2_ardour/themes/clear_gray-ardour.colors
index 1758f73dea..8f4255b5fa 100644
--- a/gtk2_ardour/themes/clear_gray-ardour.colors
+++ b/gtk2_ardour/themes/clear_gray-ardour.colors
@@ -384,6 +384,7 @@
     <ColorAlias name="send alert button: fill active" alias="alert:cyan"/>
     <ColorAlias name="send alert button: led active" alias="alert:red"/>
     <ColorAlias name="send bg" alias="neutral:backgroundest"/>
+    <ColorAlias name="send pan" alias="theme:contrasting alt"/>
     <ColorAlias name="shuttle" alias="widget:bg"/>
     <ColorAlias name="shuttle bg" alias="neutral:backgroundest"/>
     <ColorAlias name="shuttle text" alias="neutral:foregroundest"/>
diff --git a/gtk2_ardour/themes/cubasish-ardour.colors b/gtk2_ardour/themes/cubasish-ardour.colors
index 463781931b..ebe376316c 100644
--- a/gtk2_ardour/themes/cubasish-ardour.colors
+++ b/gtk2_ardour/themes/cubasish-ardour.colors
@@ -384,6 +384,7 @@
     <ColorAlias name="send alert button: fill active" alias="alert:cyan"/>
     <ColorAlias name="send alert button: led active" alias="alert:red"/>
     <ColorAlias name="send bg" alias="neutral:backgroundest"/>
+    <ColorAlias name="send pan" alias="theme:contrasting alt"/>
     <ColorAlias name="shuttle" alias="widget:bg"/>
     <ColorAlias name="shuttle bg" alias="neutral:backgroundest"/>
     <ColorAlias name="shuttle text" alias="neutral:foregroundest"/>
diff --git a/gtk2_ardour/themes/dark-ardour.colors b/gtk2_ardour/themes/dark-ardour.colors
index 7afe575ffa..23b1369857 100644
--- a/gtk2_ardour/themes/dark-ardour.colors
+++ b/gtk2_ardour/themes/dark-ardour.colors
@@ -384,6 +384,7 @@
     <ColorAlias name="send alert button: fill active" alias="alert:cyan"/>
     <ColorAlias name="send alert button: led active" alias="alert:red"/>
     <ColorAlias name="send bg" alias="neutral:backgroundest"/>
+    <ColorAlias name="send pan" alias="theme:contrasting alt"/>
     <ColorAlias name="shuttle" alias="widget:bg"/>
     <ColorAlias name="shuttle bg" alias="neutral:backgroundest"/>
     <ColorAlias name="shuttle text" alias="neutral:foregroundest"/>
diff --git a/gtk2_ardour/themes/unastudia-ardour.colors b/gtk2_ardour/themes/unastudia-ardour.colors
index 25be061395..164a04f38b 100644
--- a/gtk2_ardour/themes/unastudia-ardour.colors
+++ b/gtk2_ardour/themes/unastudia-ardour.colors
@@ -383,6 +383,7 @@
     <ColorAlias name="send alert button: fill active" alias="alert:cyan"/>
     <ColorAlias name="send alert button: led active" alias="alert:red"/>
     <ColorAlias name="send bg" alias="neutral:backgroundest"/>
+    <ColorAlias name="send pan" alias="theme:contrasting alt"/>
     <ColorAlias name="shuttle" alias="widget:bg"/>
     <ColorAlias name="shuttle bg" alias="neutral:backgroundest"/>
     <ColorAlias name="shuttle text" alias="neutral:foregroundest"/>