diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index d0bda3fe51..2ca1d9c451 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -2675,8 +2675,8 @@ scale {
 
   > trough > slider {
     @include button(normal);
-
-    border: 1px solid darken($alt_borders_color, 3%);
+    border-width: 1px;
+    border-style: solid;
     border-radius: 100%;
     transition: $button_transition;
     transition-property: background, border, box-shadow;