diff --git a/Helium/gtk-4.0/_functions.scss b/Helium/gtk-4.0/_functions.scss
index 1440fa1..412df2e 100644
--- a/Helium/gtk-4.0/_functions.scss
+++ b/Helium/gtk-4.0/_functions.scss
@@ -3,7 +3,7 @@
 }
 
 @function gtkmix($c1,$c2,$r) {
-  $ratio: 1 -  calc($r / 100%); // match SCSS mix()
+  $ratio: 1 -  calc($r / 1.0); // match SCSS mix() while being GTK-friendly
   @return unquote("mix(#{$c1},#{$c2},#{$ratio})");
 }