diff --git a/gtk/theme/HighContrast/_colors-hc.scss b/gtk/theme/HighContrast/_colors-hc.scss
index b91e12ca38..f1535a64cf 100644
--- a/gtk/theme/HighContrast/_colors-hc.scss
+++ b/gtk/theme/HighContrast/_colors-hc.scss
@@ -22,3 +22,5 @@ $focus_border_color: if($variant == 'light', transparentize($selected_bg_color,
 $alt_focus_border_color: if($variant == 'light', white, transparentize(white,0.4));
 
 $dim_label_opacity: 0.9;
+
+$switch_borders_color: if($variant == 'light',darken($switch_bg_color,15%),lighten($switch_bg_color,15%));