diff --git a/core/palettes/Rocker.tid b/core/palettes/Rocker.tid
index f2a04f6ab..0fe14cbdc 100644
--- a/core/palettes/Rocker.tid
+++ b/core/palettes/Rocker.tid
@@ -45,6 +45,7 @@ page-background: #000
 pre-background: #f5f5f5
 pre-border: #cccccc
 primary: #cc0000
+sidebar-button-foreground: <<colour foreground>>
 sidebar-controls-foreground-hover: #000000
 sidebar-controls-foreground: #ffffff
 sidebar-foreground-shadow: rgba(255,255,255, 0.0)