diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 1f13b4278f..29789542a9 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -2336,7 +2336,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
       -GtkRange-slider-width: 24;
       -GtkRange-trough-border: 2;
 
-      color: transparentize($fg_color, 0.7); // marks color
+      color: gtkalpha(currentColor, 0.5); // marks color
 
       @extend %#{$we}_#{$dn};
 
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 62aacf4c50..4a01502ee3 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -3079,7 +3079,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(238, 238, 236, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.scale-has-marks-below.slider {
     border-style: none;
     border-radius: 0;
@@ -3133,7 +3133,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(238, 238, 236, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.scale-has-marks-above.slider {
     border-style: none;
     border-radius: 0;
@@ -3187,7 +3187,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(238, 238, 236, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.vertical.scale-has-marks-below.slider {
     border-style: none;
     border-radius: 0;
@@ -3241,7 +3241,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(238, 238, 236, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.vertical.scale-has-marks-above.slider {
     border-style: none;
     border-radius: 0;
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 99bb8aad03..f8e5619e02 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -3241,7 +3241,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(46, 52, 54, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.scale-has-marks-below.slider {
     border-style: none;
     border-radius: 0;
@@ -3295,7 +3295,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(46, 52, 54, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.scale-has-marks-above.slider {
     border-style: none;
     border-radius: 0;
@@ -3349,7 +3349,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(46, 52, 54, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.vertical.scale-has-marks-below.slider {
     border-style: none;
     border-radius: 0;
@@ -3403,7 +3403,7 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   -GtkScale-slider-length: 20;
   -GtkRange-slider-width: 24;
   -GtkRange-trough-border: 2;
-  color: rgba(46, 52, 54, 0.3); }
+  color: alpha(currentColor,0.5); }
   .scale.vertical.scale-has-marks-above.slider {
     border-style: none;
     border-radius: 0;