diff --git a/gtk/gtk-win32-base.css b/gtk/gtk-win32-base.css
index 35d403ce7f..7be3f5e4af 100644
--- a/gtk/gtk-win32-base.css
+++ b/gtk/gtk-win32-base.css
@@ -812,4 +812,9 @@ GtkColorSwatch {
 
 GtkColorSwatch:prelight {
     border-color: shade (@bg_color, 0.2);
+}
+
+.separator,
+.separator:prelight {
+    color: shade (@bg_color, 0.6);
 }
\ No newline at end of file