diff --git a/src/sass/gtk/_common-3.0.scss b/src/sass/gtk/_common-3.0.scss
index 066e6aa0..d3b759b4 100644
--- a/src/sass/gtk/_common-3.0.scss
+++ b/src/sass/gtk/_common-3.0.scss
@@ -3253,7 +3253,7 @@ scrolledwindow {
 }
 
 //vbox and hbox separators
-separator:not(.titlebutton) {
+separator {
   background-color: $borders_color;
   min-width: 1px;
   min-height: 1px;