diff --git a/gtk-3.20/scss/widgets/_progress.scss b/gtk-3.20/scss/widgets/_progress.scss
index 56b3bd5..26171a0 100644
--- a/gtk-3.20/scss/widgets/_progress.scss
+++ b/gtk-3.20/scss/widgets/_progress.scss
@@ -99,7 +99,7 @@
             }
 
             &.high,
-            :not(.empty) {
+            &:not(.empty) {
                 background-color: $selected_bg_color;
                 border-color: transparent;
             }